For me, there are a few plugins that don't exist on Firefox, which I need. The plugin environment isn't nearly as robust or kept up-to-date as chromium-based browsers.
Fair enough. That's a fairly niche case, but I could see myself using a chromium browser if I had to use this tool at work, but then switching back to Firefox for everything else.
I still wouldn't use Brave, though, and it would be even better if more developers started supporting Firefox instead.
I’d be interested to hear which plugins you are referring to as my experience with Firefox has been much the opposite. I often find the plug-in selection lacking when required to use a Chromium based browser.