How big is your monitor? I can only see about 10-15 tabs on my 4k monitor before Firefox starts scrolling them off the screen. I regularly have 2-3x that on Chrome before tabs stop showing up.
I have 54 tabs open right now. The Sideberry extension lets you view them in the left sidebar. They're nested so that collapsing a root tab will also collapse all child tabs. There are also super tabs (Sideberry calls them "Tabs panels") so you can switch between entire groups of tabs.
