Restored tabs after a crash are very old tabs, not my last session: how to fix this?

Question

Whenever Mozilla crashes, which is often, my most recent session is NOT restored!! I get the oops page with 2 options: restore session or start new. I click restore session and instead of bringing me back where I was with the video I was watching that crashed in the middle, it brought me to about 12 videos prior! :-/
Can you guys fix this on your end? Surely it must be a Firefox glitch as this is new of this week: all 3 times my internet has crashed as done this whereas in the past, I'd be restored right where I left off. This is a huge problem: I nearly had ebay automatically purchase the same thing again due to reopening to a purchase page tab that had ALREADY BEEN CLOSED and my newer tabs from session that crashed with all my work (composing at blog or forum posts) are nowhere to be found. HELP, please!

Answer 1

If you experience one or more of the following problems with Firefox 23+:
* after a crash, Firefox > History > Restore Previous Session does not restore the last session, but restores the session before that one;
* YouTube videos always start muted,
then try this:
# In the [https://support.mozilla.org/en-US/kb/awesome-bar-find-your-bookmarks-history-and-tabs Location bar] type '''about:config''' and press <Enter>.
# In the Search box at the top, type '''browser.sessionstore'''.
# In the resulting grid, double-click on all lines shown in '''bold''', to set their ''Status'' to '''default'''.
# In particular, verify that ''browser.sessionstore.resume_from_crash'' has been set to '''true'''.