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Google Chrome’s uBlock Origin phaseout has begun
(www.theverge.com)
This is a most excellent place for technology news and articles.
You are correct in the proper extension support part. Until recently FF Android only supported a handful of selected addons made specifically for it.
uBlock Origin however has been one of those for almost a decade now.
I'm sorry you have been suffering ads all this time.
There were a few years when only a handful were supported. Before that it was as open as now, leaving compatibility responsibility to the extension developers.