I use Firefox with Sidebery for vertical (specifically, tree style) tabs, plus a userChrome.css to hide the native horizontal tabs. Firefox has mobile apps, and

I use Firefox with Sidebery for vertical (specifically, tree style) tabs, plus a userChrome.css to hide the native horizontal tabs. Firefox has mobile apps, and the Android app supports (some) browser extensions. It works, it's boring, and it doesn't try to shove gimmicky features in my face.