Once Firefox crashes & restarts, homepage opens (not tabs that were open prior to crash) even though "tabs from last time" is selected for when Firefox starts.
When Firefox crashes and subsequently restarts, the tabs that were open are not restored. I do not get the "well, this is embarrassing" dialogue box that gives me the option to restore tabs. When restarting, Firefox just gives me my home page. This happens even though I have selected under options for Firefox to open previous windows & tabs upon start up.
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Hopefully you still can use History > Restore Previous Session to get back to where you were.
To restore the regular behavior of resuming your previous session after a crash, you probably need to change one of your preferences back to its default value.
(1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.
(2) In the filter box, type or paste sess and pause while the list is filtered
(3) Double-click browser.sessionstore.resume_from_crash to switch its value from false to true.
If you prefer to always get the "this is embarrassing" screen rather than having Firefox re-open all the windows and tabs immediately, also change this preference:
(4) Double-click browser.sessionstore.max_resumed_crashes and change the value from 1 to 0.
Hope that helps in the unfortunate event that you have a crash!
Now, about those crashes... with some more data, we might be able to help. This article describes some standard troubleshooting, and also how you can provide links to crash data you may have submitted to Mozilla: Troubleshoot Firefox crashes (closing or quitting unexpectedly).