Go to the Settings page, scroll down to the bottom.
Tap on "About Firefox".
Tap on the Firefox logo 5 times. It will display a message that says "Debug Menu enabled".
If you go back to the Settings page, you'll notice that a new option is available under the Advanced section.
It's called Custom Add-on Collections.
Tap on it, and it will ask you to enter the collection owner's ID, and the collection's name.
The ID is a unique 6-digit number that can be found in your add-on collection's URL.
The name of course refers to the collection's name, unlike the number this is something that you can choose.
For example, https://addons.mozilla.org/en-US/firefox/collections/926754/ghacks/
The ID for this collection is 926754 and the name is ghacks.
Currently don't own a desktop, any chance someone converts the framework to be functional as a user script, we already have one that blocks instances.
https://greasyfork.org/en/scripts/469297-block-lemmy-instances
Android users can install the user script using Firefox,
Using this method with Mull & Tampermonkey.