[LocalPCGuy]

For people with a lot of tabs, I recommend trying a Vertical Tabs add-on. I am currently using Vertical Tabs Reloaded, but there are a couple different ones. Usually people have plenty of horizontal space and you have a scrollable sidebar with all your tabs in it.

[alleyshack]

Thanks, but I'm looking for something that doesn't require scrolling - where I can see all my open tabs at the same time, no scrolling, clicks, or other interaction required. I toggle between tabs a LOT, and having to scroll or otherwise navigate to find the right tab is a hard no for me.

[LocalPCGuy]

The Firefox search also searches open tabs a lot. Which could be even quicker than using the mouse. There is a limit on Chromium browsers - tabs smaller than the favicon aren't really that useful.