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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.
It used to be able to support all desktop addons but they for some reason took that away a while back
The reason was they completely rewrote the mobile browser.
I didn't know it was a mass rewrite, I just assumed they ruined the UI and features to "keep" up with mobile chrome, as most of these big tech companies do