more info here: https://blog.mozilla.org/addons/2023/11/01/is-your-extension-ready-for-firefox-for-android/
earlier, we could use extensions(except for 7-8 highly poplar ones) with an account containing add-ons collection(in nightly versions). But now it's coming to beta and stable as well.
image transcription:
collage of Mr bean waiting in the field with the text "Me waiting for more extensions in Firefox for Android."
below is another Mr bean image, this time excited, sitting in a plane with the text that reads "they are arriving in version 120."
I've been using Firefox Nightly for Android and synched my Addons with my FF account. Works like a charm. I love using cookie message blocker, user agent faker etc.
I've been using desktop addons on Fennec for at least half a year now...