When Firefox crashes, the tabs return, but I have to start (and remember) where I was in each video?
I often have a dozen vids open, and am some distance into each of them... 5 minutes, 10 mins, whatever. Firefox (or my system) crashes. The tabs restore - but each of the vids is at the beginning. Is there a way for Firefox to remember exactly how far into each of these dozen or 2 dozen vids I was when the crash occurred - and then return me to that point?
Opaite Mbohovái (1)
There is no way to know for Firefox where a video was interrupted because of that crash. Such videos are played by a plugin that loads the files.
You will have to find the cause of the crashes and fix that as crashes shouldn't happen.
You can try a new profile with no extensions enabled (check that in Tools > Add-ons > Extensions) and only the (Flash) plugin enabled that is used to play those videos. to see if that works.
You can also try to disable Out-Of-Process-Plugins for Flash.
See http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins