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Why do you use firefox?
(upload.wikimedia.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Vivaldi is chromium based and not fully open source. It doesn't deserve any more trust than chrome/edge/safari/etc.
Oh, you're right the UI code is closed source. Hate to admit it, but it kind of makes sense given it looks so nice ๐