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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.
Well, let me know when you're using either for your regular browsing. If that's in my lifetime, I'll happily admit they were a bad example (and be a lot more comforted about the state of the web).
Servo recently had a blog update where they dropped some amazing news, gmail and google chat now works, so while it's not what you were wanting, it is some good news :D