I recommend Sidebery, but more than that I just recommend something to get your tabs listed vertically in a sidebar, so they don't squash each other up as you add more until you can't tell what's what at a glance, the width is fixed, and you can always read the title.
Which probably means implicitly 'I recommend FF', since I imagine Safari/Chrome/Edge don't let you make that kind of modification? FF actually doesn't even need an add-on for it, I used to do it just with a userChrome tweak I copied from somewhere, but Sidebery has a nice 'panels' (like tabs of tabs to switch between that the sidebar shows) feature, and you can bind them to the built-in 'container tabs' (which I always think should surely be called 'tab containers'?) so that work stuff opens in your work panel, for example.