[m-p-3]

Give a shot to Zen Browser, it's based on Firefox with all that you mentionned.

https://zen-browser.app/

(I'm not affiliated, just enjoying it)

[varun_ch]

https://github.com/zen-browser/desktop/pull/927 this certainly put a bad taste in my mouth

[sp33der89]

Does Zen browser allow you to hide the top (address) bar? That's the thing I liked about Arc.