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Session lost after upgrade to 56.0.2, how to fix ?

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I have to start off with the fact that i had a lot of open (but unloaded) tabs, like several thousands (don't judge or ask), this (as expected) has cause Firefox to slow down pretty bad, i also turned off that MultiProcess windows feature because one of my favorite plugins didn't work with it on, so that didn't help.

The slowdown got so bad that i kinda avoided using Firefox, it took literally 5 minutes for it to load completely, although other than the titles and favicons of the tabs i really don't know what needed to be loaded for so long, this also took up like 4GB of ram, even though the sessionstore file is 23MB, seems like more work could be done on that.

Anyway i clicked the wrong browser tab today and it opened Firefox instead, which opened just fine and fast because it was asking me to restore the previous session (last time i used it i think i had a power loss), so i clicked on restore and it seemed to get to work as usual and the last open tab loaded, but nothing responded and when i clicked on anything it said Not Responding in the top bar, this isn't anything unusual to me, usually it recovers in 30 seconds or less, but this time it didn't, so i was forced to close it.

I opened Firefox again, hoping this time it would load properly, but i got the "firefox is upgrading" message and after opening the Restore session dialog was there again, but it was empty and the Restore button was grayed out, which makes no sense really.

So i searched online for any solutions, found some about the Sessionstore JS files, made a backup of the Sessionstore-backup folder and the sessionstore.js file, but these solutions never say what exactly you're supposed to do, they only go as far as to tell you where the session files are, nothing more, like how is that any help?

Anyway i copied the 'previous.js' file from the backup folder and replaced 'sessionstore.js' file with it, all the while FF was open, so i closed it and reopened it to see if it worked, but nothing changed.

Any suggestions ?

One of the support topics (https://support.mozilla.org/en-US/questions/1179413) had a link to Jefferson Scher's site which took any of your session files and extracted all the links from them and i used that and i got a massive list of all the tabs i had and their URLs, so with a few weeks work i could add all those back by hand.

That same topic talked about recent changes to how the sessions were being stored (moved from .js files to compressed .jsonlz4 files), seems this is NOT backwards compatible and therefor automatic upgrades should be DISABLED. This is also probably why the 'Restore Previous Session' button is grayed out in the History "tab".

Is there any way to use my 'previous.js' file to restore my session ? cuz it's intact, all my tabs are there, Firefox just won't use them, do i need to make a sessionstore.jsonlz4 file ? i don't seem to have on at the moment, also how do i compress a .js file to a .jsonlz4 file ?

(The 'Automatically add' troubleshooting information button when making a new post seems to be broken, took me to a page not found page, used the manual way.)

I will be monitoring this daily, so feel free to answer with anything relevant.

I have to start off with the fact that i had a lot of open (but unloaded) tabs, like several thousands (don't judge or ask), this (as expected) has cause Firefox to slow down pretty bad, i also turned off that MultiProcess windows feature because one of my favorite plugins didn't work with it on, so that didn't help. The slowdown got so bad that i kinda avoided using Firefox, it took literally 5 minutes for it to load completely, although other than the titles and favicons of the tabs i really don't know what needed to be loaded for so long, this also took up like 4GB of ram, even though the sessionstore file is 23MB, seems like more work could be done on that. Anyway i clicked the wrong browser tab today and it opened Firefox instead, which opened just fine and fast because it was asking me to restore the previous session (last time i used it i think i had a power loss), so i clicked on restore and it seemed to get to work as usual and the last open tab loaded, but nothing responded and when i clicked on anything it said Not Responding in the top bar, this isn't anything unusual to me, usually it recovers in 30 seconds or less, but this time it didn't, so i was forced to close it. I opened Firefox again, hoping this time it would load properly, but i got the "firefox is upgrading" message and after opening the Restore session dialog was there again, but it was empty and the Restore button was grayed out, which makes no sense really. So i searched online for any solutions, found some about the Sessionstore JS files, made a backup of the Sessionstore-backup folder and the sessionstore.js file, but these solutions never say what exactly you're supposed to do, they only go as far as to tell you where the session files are, nothing more, like how is that any help? Anyway i copied the 'previous.js' file from the backup folder and replaced 'sessionstore.js' file with it, all the while FF was open, so i closed it and reopened it to see if it worked, but nothing changed. Any suggestions ? One of the support topics (https://support.mozilla.org/en-US/questions/1179413) had a link to Jefferson Scher's site which took any of your session files and extracted all the links from them and i used that and i got a massive list of all the tabs i had and their URLs, so with a few weeks work i could add all those back by hand. That same topic talked about recent changes to how the sessions were being stored (moved from .js files to compressed .jsonlz4 files), seems this is NOT backwards compatible and therefor automatic upgrades should be DISABLED. This is also probably why the 'Restore Previous Session' button is grayed out in the History "tab". Is there any way to use my 'previous.js' file to restore my session ? cuz it's intact, all my tabs are there, Firefox just won't use them, do i need to make a sessionstore.jsonlz4 file ? i don't seem to have on at the moment, also how do i compress a .js file to a .jsonlz4 file ? (The 'Automatically add' troubleshooting information button when making a new post seems to be broken, took me to a page not found page, used the manual way.) I will be monitoring this daily, so feel free to answer with anything relevant.

Chosen solution

OK, it seems i found a solution to my problem (as usual, cuz nobody else will).

I googled 'js to jsonlz4' and found this support article: https://support.mozilla.org/en-US/questions/1173678#answer-1002306

In short:

  • Close Firefox
  • Go to profile folder
  • Backup sessionstore-backups folder (i also backed up the entire profile folder, just in case, didn't need any of it)
  • Remove all *.jsonlz4 files from sessionstore-backups folder as well as sessionstore.jsonlz4 from profile folder.
  • Copy "previous.js" (might be recovery.js in your case) from backup folder to main profile folder and rename it to sessionstore.js.
  • Start FF

This worked for me.

I also removed some older/other session related files, which might have been causing the slow loading issues, as this time FF loaded up much faster, almost normal, less than 30 seconds, maybe even 20s, compared to 5-10 minutes. Don't know about next time. Even switching from 32bit to 64bit FF didn't fix that.

If you're using the latest Win 10 (Fall Creators update), you might have issues renaming or overwriting files in your C:/ (OS) Drive, i had to first delete the file i wanted overwritten, only then could i rename anything with the same name.

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Additional System Details

Installed Plug-ins

  • Shockwave Flash 26.0 r0

Application

  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0

More Information

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user.js Preferences
-------------------
Your profile folder contains a user.js file, which includes preferences that were not created by Firefox.
Important Locked Preferences
----------------------------
Places Database
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JavaScript
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Incremental GC: true
Accessibility
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Activated: false
Prevent Accessibility: 0
Accessible Handler Used: true
Library Versions
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NSPR
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NSS
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NSSSMIME
Expected minimum version: 3.32.1
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NSSSSL
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NSSUTIL
Expected minimum version: 3.32.1
Version in use: 3.32.1
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---------------------
Sandbox
-------
Content Process Sandbox Level: 3
Effective Content Process Sandbox Level: 3

Chosen Solution

OK, it seems i found a solution to my problem (as usual, cuz nobody else will).

I googled 'js to jsonlz4' and found this support article: https://support.mozilla.org/en-US/questions/1173678#answer-1002306

In short:

  • Close Firefox
  • Go to profile folder
  • Backup sessionstore-backups folder (i also backed up the entire profile folder, just in case, didn't need any of it)
  • Remove all *.jsonlz4 files from sessionstore-backups folder as well as sessionstore.jsonlz4 from profile folder.
  • Copy "previous.js" (might be recovery.js in your case) from backup folder to main profile folder and rename it to sessionstore.js.
  • Start FF

This worked for me.

I also removed some older/other session related files, which might have been causing the slow loading issues, as this time FF loaded up much faster, almost normal, less than 30 seconds, maybe even 20s, compared to 5-10 minutes. Don't know about next time. Even switching from 32bit to 64bit FF didn't fix that.

If you're using the latest Win 10 (Fall Creators update), you might have issues renaming or overwriting files in your C:/ (OS) Drive, i had to first delete the file i wanted overwritten, only then could i rename anything with the same name.

OK, it seems i found a solution to my problem (as usual, cuz nobody else will). I googled 'js to jsonlz4' and found this support article: https://support.mozilla.org/en-US/questions/1173678#answer-1002306 In short: * Close Firefox * Go to profile folder * Backup ''sessionstore-backups'' folder (i also backed up the entire profile folder, just in case, didn't need any of it) * Remove all ''*.jsonlz4'' files from ''sessionstore-backups'' folder as well as ''sessionstore.jsonlz4'' from profile folder. * Copy "previous.js" (might be ''recovery.js'' in your case) from backup folder to main profile folder and rename it to ''sessionstore.js''. * Start FF This worked for me. I also removed some older/other session related files, which might have been causing the slow loading issues, as this time FF loaded up much faster, almost normal, less than 30 seconds, maybe even 20s, compared to 5-10 minutes. Don't know about next time. Even switching from 32bit to 64bit FF didn't fix that. If you're using the latest Win 10 (Fall Creators update), you might have issues renaming or overwriting files in your C:/ (OS) Drive, i had to first delete the file i wanted overwritten, only then could i rename anything with the same name.