### Is this a feature request or a bug?


### What is the current behavior?
<!--
* If this is a bug, please explain how to reproduce the problem and
  include the `web-ext` commands you ran.
* Do not include sensitive information like API secrets.
* Upload a text log created with the verbose flag if possible.
* Upload a zip file of your web extension source if necessary.
-->


### What is the expected or desired behavior?


### Version information (for bug reports)

* **Firefox version**:
* **Your OS and version**:
* Paste the output of these commands:

````
node --version && npm --version && web-ext --version
````