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Firefox to become first mobile browser to support desktop extensions later this year
(blog.mozilla.org)
This is a most excellent place for technology news and articles.
I remember wanting to try out Firefox on Android but not being able to use it with Tampermonkey which was a real bummer. Better late than never, I guess?
One question on my mind is why it took so long. Is Android a harder platform to make extensions available on or something?
It did support extensions until they basically redesigned the app from the ground up a few years back. They said they'd focus on stability first then move on from there.
You can use tamper monkey now.