Another firefox fork, zen.
TL;DR: Just like arc, but without chromium.
I found this browser while surfing on reddit, many people recommend either zen browser or librewolf for firefox fork, since I already use librewolf and have no issue, its been a month since I install zen browser
Interface
Look at this bar on the left

That just as functioning as arc, but simpler cause I already customized it though, for real it looks cool and I can install more customization here and last month I check it was just 1 or 2 pages, now they multiplied to 6!
My favourite feature: Split tabs
Everything else is kinda looks the same as firefox, what i like is dual tabs or split tabs is what they called on this browser.

sometimes i need to look at 2 pages at the sametimes like this, for writing while researching for my blog content just like this.
Downside
Only downside I found was it hibernate my inactive tabs for like a while, its big problem for me since I only close tabs when I don't need it at all or its out of working time, in the middle of my research sometimes it refresh the tabs and I got lost where am I last time browsing this pages,
Little did I know its a feature to free up some memories for user like tab hoarders, but not for me, previously it set at 20 minutes, so everytime I doing something other than browsing like watching videos or coding, it suspend my tabs and refresh then it will become a problem cause everytime I reload my tabs it consume my memory or battery or both even more, cause I reopen almost everytab while its still being used but got auto suspended.
Now I set it to 24 hours before being suspended, even though tabs that opened 24 hours probably should be closed

It got more feature that I dont use (yet) liek sidebar it kinda feels like split tabs but always there? its feature that not suit my needs right now so I never uses it, I think it will useful for chattings app like whatsapp or telegram IDK.
Thoughts and prayer
I think I will give zen a ride once more (I just abandond it for firefox for about a week) but for real I kinda like zen browser.