Waterfox might be what you’re after?
- Supports JXL out of the box (including support for alpha transparency and animations)
- Vertical tabs with optional tree tabs (hired the original tree style tab developer to implement the feature)
- For profit, but I don’t want your data, collect it or use it to earn a living (telemetry/analytics/experiments disabled at build time and alongside a fair few patches on top to make sure external connections are limited to what’s necessary)
Sidebar, I’m the developer of Waterfox
Firefox (with minor changes + addons) is what I use today, works well for what I care about. Thanks for the recommendation though!
While you're here, last time I came across your website (and it seems like it looks the same currently), I noticed that your browser comparison is not including Firefox, which is what you've forked from (as far as I can tell at least, it isn't made clear by the landing page actually, but the UI and name makes it obvious), which feels like it's a bit misleading almost intentionally.