But it's not a "major browser." It's a niche fork that has valuable adjustments for power users, but would be unusable for your average non-technically inclined user. I use Librewolf myself and appreciate it, but it's not something you can just drop on an older relative's machine and expect to work fine. Firefox has plenty of issues out of the box with sneaking in ads and telemetry, but at the same time you still have to understand that it's an important player in the market despite its flaws because it's the only real mainstream competitor to an entirely Chromium-based ecosystem, and despite the issues it does have, it's still lightyears ahead of Chrome.