{
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            },
            "edge": {
              "version_added": false
            },
            "firefox": {
              "version_added": "63"
            },
            "firefox_android": {
              "version_added": false
            },
            "opera": {
              "version_added": false
            },
            "safari": {
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            "standard_track": false,
            "deprecated": false
          }
        },
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            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/manifest.json/theme_experiment#Syntax",
            "support": {
              "chrome": {
                "version_added": false
              },
              "edge": {
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              },
              "firefox": {
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              },
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            },
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            }
          }
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            "mdn_url": "https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/manifest.json/theme_experiment#Syntax",
            "support": {
              "chrome": {
                "version_added": false
              },
              "edge": {
                "version_added": false
              },
              "firefox": {
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              },
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              },
              "opera": {
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              },
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              }
            },
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        },
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            "support": {
              "chrome": {
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              },
              "edge": {
                "version_added": false
              },
              "firefox": {
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              },
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                "version_added": false
              },
              "opera": {
                "version_added": false
              },
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                "version_added": false
              }
            },
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              "standard_track": false,
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          }
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      }
    }
  }
}