In Firefox you can search among open tabs by typing % in the awesomebar, I use this everyday with hundreds of tabs open. And there is also tab groups feature (which is activated by ctrl/cmd+shift+e). I don't know why this feature is not advertised more.
The "%" search sounds really interesting, but I can't seem to get it to work. No matter what I type after the "%", it initiates a web search. This is with Firefox 33 for Mac.
Probably because you have to put a space after % (not sure why, but likely to disambiguate it from other sorts of typing).
It rocks. And I have 1200 tabs open at the moment on Linux64 Nightly (~120 actually loaded). Yes, I'm a tab-hoarder. Bookmarks are useful, but don't give me the easy "I want to come back to this" aspect - once I do close it, I'm done with it; if I bookmark it it's there forever (and the number of bookmarks became unmanagable eventually).
Every so often I do a pass and close out 50 or 100 tabs I no longer care about. Usually I sit at 900-1000; it's time to cull.
