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They changed the Twitter logo rule (again again)
(lemmy.blahaj.zone)
Alt Text: A screenshot of a Homescreen with lots of apps on it, notably all open source and almost all using the material you colouring scheme. Two arrows pointing to one app in particular, the Twitter App, which has gotten a new logo: an X.
Also iceraven is a good modified version of fennec (the best part is it has more extensions out of the box)