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Firefox Forever
(www.quippd.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
Tbf, Mozilla donations don't go to Firefox.
It always struck me as odd that there is no way to give to firefox given that anybody can give to thunderbird directly.