In the coming months Mozilla will launch support for an open ecosystem of extensions on Firefox for Android on addons.mozilla.org (AMO). We’ll announce a definite launch date in early September, ...
You can also use the Nightly app and load addon collections. It’s an absolute pain in the arse, and a lot of extensions don’t work, but it’s one way to get them.
For every one who want to test it out you can use iceraven browser a Firefox fork that supports way more extensions than stock Firefox mobile https://github.com/fork-maintainers/iceraven-browser
You can also use the Nightly app and load addon collections. It’s an absolute pain in the arse, and a lot of extensions don’t work, but it’s one way to get them.
I didn’t know that this feature is already dort of waring in the nightly build but it makes sence that they will test it out in nightly