I switched to Orion[0] as a test, discovered the awesomeness of superbly integrated, native, tree style tabs, and now I'm stuck with this browser where sites I need for work are half broken.
I tried Firefox with Tree Style Tab extension, but it's not nearly as good :(
On firefox you can also use sidebery. If I recall correctly it worked decently well. Currently I'm using Arc which performs well enough for my use cases, although being locked into chromium kinda sucks.
[0] https://browser.kagi.com