You can now install any add-on in Firefox Nightly for Android, but it is complicated

[harlan4096]

Mozilla released a new Firefox Nightly version for Android, and this one is special, as it is the first version of the new Firefox for Android that allows users to install any extension that is listed on Mozilla's official add-ons repository Mozilla AMO.

The restoration of full add-ons support in Firefox for Android is a major request by users of the browser. While it is unclear how many Firefox users on Android used add-ons prior to being upgraded to the new Firefox, it is clear that most add-on users lost access to extensions when the upgrade happened.

Firefox for Android Stable supports just a few extensions currently, but Mozilla promised that it would regain full add-ons support eventually.
Mozilla created the override in Firefox Nightly for extension developers and advanced users only, and made it difficult to enable full extensions support.

The entire system is based on Mozilla's Collections system. It is not possible to install an extension directly from its main Mozilla AMO profile page, and there does not seem to be a way to browse available collections. Also, Firefox's default selection of add-ons seems to use the same system and it will be replaced by the Collection that you select. If an installed extension is not in the new Collection, it will be uninstalled.

Attention: Not all extensions will work; it should be clear for some, e.g. add-ons that modify how tabs are displayed in the browser. Firefox for Nightly may lack support for some add-on APIs as well and you may run into issues when using the browser because of that.
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