Wed Oct 2, 2013
I wrote a Firefox addon one afternoon in France called TabStash. It’s quite simple: you click a button to close all your tabs except the current one. You click it again to open all of them. (Chrome has a popular extension called OneTab that does this, but at the time there wasn’t a Firefox version.)
A couple nights ago, I finally got around to sending it to the Mozilla addon store. It came out yesterday and already has some downloads, to my surprise.
Anyway, you can find it at https://addons.mozilla.org/en-US/firefox/addon/tabstash/.