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Mozilla tells extension developers to get ready to finally go mobile
(www.theregister.com)
This is a most excellent place for technology news and articles.
There are only 22 add-ons for the mobile version (2 of which come pre-installed: uBlock and night mode), and they were all hand-picked or made by the devs to be ported. It doesn't have support for the whole system like on desktop, where there are thousands of add-ons with new ones being added every day.