There's a lot of reasons to use Firefox and its derivatives, it being open source is a perfectly valid one, and has a great many implications. Can we trust Viv

There's a lot of reasons to use Firefox and its derivatives, it being open source is a perfectly valid one, and has a great many implications. Can we trust Vivaldi? Without 100% of its source being available, the answer is dependent upon your threat model and what you intend to use a browser for along with where you live. Vivaldi has poor feature parity with its mobile apps too.