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How-to install custom extension (xpi file) on Firefox 84 ?

  • 3 replies
  • 1 has this problem
  • Last reply by Seburo

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I'm using a custom extension for Firefox on Android that I've installed with the "open with" technique from a file browser. This worded well until I removed Firefox and reinstalled it again today with a new Firefox version.

Today I'm not able to install the extension with "open with" from my file browser (Solid explorer), even when I select "all" apps (so without taking mime type onto account).

Is it still possible to install extensions from XPI files in Firefox 84? Did I missed something?


All Replies (3)

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No, for now you can't install a custom extension this way.

In the release version you can only choose those from the list in menu -> Addons.


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This isn't a good news at all for me and my work team. We're using a custom developed extension for work (to automate specific tasks to client's servers).

We'll have to downgrade to the last version of freedom :(

Anyone does know: - what is the last version where custom apk installation was possible ? (I ckecked the changelog but it was limited to a certain amount of versions) - is there any fork that disable this limitation ?

I'll look to an open issue for it; I'm super surprised of this big freedom limitation in an open source project :(

Modified by brunetton


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I am sorry, but there is not going to be a positive answer to either of those points.

Even if you did sideload (never recommended) an older version, you would not get ongoing security and stability updates.

I am not aware of any fork that you could use that would support your add-on.

If the add-on was deployed from the Mozilla add-on site, there is a way that you could deploy it to a Nightly version of Firefox for Android. This approach is designed to assist add-on developers test add-ons prior to support for add-ons being widened in future updates.


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