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Not at all. It is based on the Web engine of the most used browser. Firefox is still Firefox, the big difference for me with the 2000s being the decline of its market share and that it doesn't compete with a browser with a non standard-compliant browser. Instead, it competes with a browser that defines the standards.
Old Firefox was a platform that ran a unique ecosystem of extensions, had innovative features that nobody on IE6 had and represented a push towards a web that didn't quite exist yet - an open place with standards where developers were free of having some disinterested tyrant controlling what they could do. It is still Firefox, but that battle has been won. Firefox won it, then Google came in with Chrome and pounded t…
Brave is more like Opera by building in support for a bunch of additional protocols.