What have you done with my session manager files during version 57 update?
In version 56 I used Session Manager addon to provide a useful means of saving open tabs so that when Firefox inevitably crashes there was a method to restore previously open tabs. Now after the 57 update I cannot find the Session Manager files like , have you deleted them during the automatic update?
Chosen solution
Your files should still be there but inaccessable because the addon that was using them does not work anymore. In order to access them you can install and use the Firefox ESR version available here :
https://www.mozilla.org/en-US/firefox/organizations/all/
That way you can either use this version to do your work or at the very least you can access your sessions and maybe save them using the Bookmark All Tabs option which creates a bookmark folder where you'll find all tabs that were in that session. You can restore the entire session by right clicking that folder and selecting Open All in Tabs. I know it's not the same, but it's a functional method.
P.S. : Firefox and Firefox ESR use the same files and addons so changing something using one of them changes it for the both of them. This is also the reason why they cannot both be executed and running at the same time.
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Here are your choices; 1) Contact its support and ask if they will update 2) Find a replacement 3) Downgrade to a prior Firefox 4) Do without
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Your files should still be there but inaccessable because the addon that was using them does not work anymore. In order to access them you can install and use the Firefox ESR version available here :
https://www.mozilla.org/en-US/firefox/organizations/all/
That way you can either use this version to do your work or at the very least you can access your sessions and maybe save them using the Bookmark All Tabs option which creates a bookmark folder where you'll find all tabs that were in that session. You can restore the entire session by right clicking that folder and selecting Open All in Tabs. I know it's not the same, but it's a functional method.
P.S. : Firefox and Firefox ESR use the same files and addons so changing something using one of them changes it for the both of them. This is also the reason why they cannot both be executed and running at the same time.
@Alex Thanks for the info and link. I've found the Session Manager session files in C:\Users\<user name>\AppData\Roaming\Mozilla\Firefox\Profiles\<random-alpha-numeric>.default\sessions\
That's a good start (I had been looking in 'local' instead of 'roaming').
Simply checking a setting to restore a previous session is the best way, but this at least works: Click the hamburger icon on the right end of the main toolbar.
Select Restore Previous Session Hope that helps a bit.
Modified by pdqpat