If you have multiple tabs open in Firefox, hit the F12 key and you will see a “Showcase” view that shows you large thumbnails of all the open windows…
It appears to be this plug-in: https://addons.mozilla.org/en-US/firefox/addon/1810
I don’t -think- I installed this on my own.
To quote former A.G. Gonzales “I have no recollection of those events”.
So I think this is a handy utility Zonbu included in the default build, cool. Can someone else confirm that they have this F12 functionality?
Kind of neat. I like it.