{
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            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/BooleanDelta",
            "support": {
              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "47"
              },
              "firefox_android": {
                "version_added": "48",
                "version_removed": "79"
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          }
        },
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            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/DangerType",
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              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "47"
              },
              "firefox_android": {
                "version_added": "48",
                "version_removed": "79"
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          }
        },
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            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/DoubleDelta",
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              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "47"
              },
              "firefox_android": {
                "version_added": "48",
                "version_removed": "79"
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          }
        },
        "DownloadItem": {
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              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
                },
                "firefox": {
                  "version_added": "47"
                },
                "firefox_android": {
                  "version_added": "48",
                  "version_removed": "79"
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          },
          "byExtensionName": {
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              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
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                  "version_added": "47"
                },
                "firefox_android": {
                  "version_added": "48",
                  "version_removed": "79"
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
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          "bytesReceived": {
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              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
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                "firefox": {
                  "version_added": "47"
                },
                "firefox_android": {
                  "version_added": "48",
                  "version_removed": "79"
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          },
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              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
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                  "version_added": "47"
                },
                "firefox_android": {
                  "version_added": "48",
                  "version_removed": "79"
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                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          },
          "danger": {
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              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
                },
                "firefox": {
                  "notes": "Always given as 'safe'.",
                  "version_added": false
                },
                "firefox_android": {
                  "notes": "Always given as 'safe'.",
                  "version_added": false
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          },
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              "support": {
                "chrome": {
                  "version_added": true
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                "edge": {
                  "version_added": "79"
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                "firefox": {
                  "version_added": false
                },
                "firefox_android": {
                  "version_added": false
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
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                "chrome": {
                  "version_added": true
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                  "version_added": "79"
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                "firefox": {
                  "version_added": "47"
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                  "version_added": "48",
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                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
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              }
            }
          },
          "estimatedEndTime": {
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              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
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                "firefox": {
                  "version_added": "57"
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                  "version_added": "57",
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                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
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          "exists": {
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              "support": {
                "chrome": {
                  "version_added": true
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                  "version_added": "79"
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                "firefox": {
                  "version_added": "47"
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                "firefox_android": {
                  "version_added": "48",
                  "version_removed": "79"
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                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
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              }
            }
          },
          "filename": {
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              "support": {
                "chrome": {
                  "version_added": true
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                "edge": {
                  "version_added": "79"
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                "firefox": {
                  "version_added": "47"
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                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
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              }
            }
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              "support": {
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                  "version_added": true
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                  "version_added": "79"
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                "firefox": {
                  "version_added": "47"
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                  "version_added": "48",
                  "version_removed": "79"
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
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          "id": {
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              "support": {
                "chrome": {
                  "version_added": true
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                  "version_added": "79"
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                "firefox": {
                  "version_added": "47"
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                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
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              }
            }
          },
          "incognito": {
            "__compat": {
              "support": {
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                  "version_added": true
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                "firefox": {
                  "version_added": "47"
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                "opera": {
                  "version_added": true
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                  "version_added": false
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              "support": {
                "chrome": {
                  "version_added": true
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                },
                "firefox": {
                  "version_added": "47"
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                "firefox_android": {
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                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
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              }
            }
          },
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              "support": {
                "chrome": {
                  "version_added": true
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                  "version_added": "79"
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                "firefox": {
                  "version_added": "47"
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                  "version_removed": "79"
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                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
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              }
            }
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                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
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                "firefox": {
                  "version_added": "47"
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                "firefox_android": {
                  "version_added": "48",
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                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
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              }
            }
          },
          "startTime": {
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              "support": {
                "chrome": {
                  "version_added": true
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                  "version_added": "79"
                },
                "firefox": {
                  "version_added": "47"
                },
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                  "version_added": "48",
                  "version_removed": "79"
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
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              }
            }
          },
          "state": {
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                  "version_added": "79"
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                "firefox": {
                  "version_added": "47"
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                "opera": {
                  "version_added": true
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                  "version_added": false
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              }
            }
          },
          "totalBytes": {
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                "chrome": {
                  "version_added": true
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                  "version_added": "79"
                },
                "firefox": {
                  "version_added": "47"
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                "firefox_android": {
                  "version_added": "48",
                  "version_removed": "79"
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          },
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                "chrome": {
                  "version_added": true
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                "edge": {
                  "version_added": "79"
                },
                "firefox": {
                  "version_added": "47"
                },
                "firefox_android": {
                  "version_added": "48",
                  "version_removed": "79"
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          }
        },
        "DownloadQuery": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/DownloadQuery",
            "support": {
              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "47"
              },
              "firefox_android": {
                "version_added": "48",
                "version_removed": "79"
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          }
        },
        "DownloadTime": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/DownloadTime",
            "support": {
              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "47"
              },
              "firefox_android": {
                "version_added": "48",
                "version_removed": "79"
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          }
        },
        "FilenameConflictAction": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/FilenameConflictAction",
            "support": {
              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "47"
              },
              "firefox_android": {
                "version_added": "48",
                "version_removed": "79"
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          },
          "prompt": {
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              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
                },
                "firefox": {
                  "version_added": false
                },
                "firefox_android": {
                  "version_added": false
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          }
        },
        "InterruptReason": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/InterruptReason",
            "support": {
              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "47"
              },
              "firefox_android": {
                "version_added": "48",
                "version_removed": "79"
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          }
        },
        "State": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/State",
            "support": {
              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "47"
              },
              "firefox_android": {
                "version_added": "48",
                "version_removed": "79"
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          }
        },
        "StringDelta": {
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            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/StringDelta",
            "support": {
              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "47"
              },
              "firefox_android": {
                "version_added": "48",
                "version_removed": "79"
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          }
        },
        "acceptDanger": {
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            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/acceptDanger",
            "support": {
              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": false
              },
              "firefox_android": {
                "version_added": false
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          }
        },
        "cancel": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/cancel",
            "support": {
              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "48"
              },
              "firefox_android": {
                "version_added": "48",
                "version_removed": "79"
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          }
        },
        "download": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/download",
            "support": {
              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": "47"
              },
              "firefox_android": {
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                "version_removed": "79"
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          },
          "allowHttpErrors": {
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              "support": {
                "chrome": {
                  "version_added": false
                },
                "edge": {
                  "version_added": false
                },
                "firefox": {
                  "version_added": "71"
                },
                "firefox_android": {
                  "version_added": false
                },
                "opera": {
                  "version_added": false
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          },
          "body": {
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              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
                },
                "firefox": {
                  "version_added": "52"
                },
                "firefox_android": {
                  "version_added": "52",
                  "version_removed": "79"
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          },
          "conflictAction": {
            "__compat": {
              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
                },
                "firefox": {
                  "version_added": "47"
                },
                "firefox_android": {
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                  "version_removed": "79"
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          },
          "filename": {
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              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
                },
                "firefox": {
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                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
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              }
            }
          },
          "headers": {
            "__compat": {
              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
                },
                "firefox": {
                  "notes": "<code>Referer</code> headers supported from version 70.",
                  "version_added": "47"
                },
                "firefox_android": {
                  "version_added": "48",
                  "version_removed": "79"
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          },
          "incognito": {
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              "support": {
                "chrome": {
                  "version_added": false
                },
                "edge": {
                  "version_added": false
                },
                "firefox": {
                  "version_added": "57"
                },
                "firefox_android": {
                  "version_added": "57",
                  "version_removed": "79"
                },
                "opera": {
                  "version_added": false
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          },
          "method": {
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              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
                },
                "firefox": {
                  "notes": "POST is supported from version 52.",
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                },
                "firefox_android": {
                  "notes": "POST is supported from version 52.",
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                  "version_removed": "79"
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          },
          "saveAs": {
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              "support": {
                "chrome": {
                  "version_added": true
                },
                "edge": {
                  "version_added": "79"
                },
                "firefox": {
                  "notes": "Before version 58, if this option was omitted, Firefox would never show the file chooser, regardless of the value of the browser's preference.",
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                  "version_removed": "79"
                },
                "firefox_android": {
                  "version_added": false
                },
                "opera": {
                  "version_added": true
                },
                "safari": {
                  "version_added": false
                }
              }
            }
          }
        },
        "drag": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/drag",
            "support": {
              "chrome": {
                "version_added": true
              },
              "edge": {
                "version_added": "79"
              },
              "firefox": {
                "version_added": false
              },
              "firefox_android": {
                "version_added": false
              },
              "opera": {
                "version_added": true
              },
              "safari": {
                "version_added": false
              }
            }
          }
        },
        "erase": {
          "__compat": {
            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/downloads/erase",
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}