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Firefox crahed and I was given an option to keep the good tabs with. "TICKS". I did this and I foud that the ticked ones were

Hasanat
Hasanat
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After crashing twice, Firefox gave me an option to remove the tabs which may be causing the problem, But I found that all the tabs were ticked already, and there a "o" along side, I removed he ticked tabs which I did not need and was replaced with an "o".. After OK;d it I found that in the web page, tabs which I removed and that I had NOT ticked, was the Tabs and the tabs which I did not want was in the web page, In other words the ticked tabs were REVERSED with the non ticked ones. HOW CAN I REREVERSE THE TABS AGAIN?

After crashing twice, Firefox gave me an option to remove the tabs which may be causing the problem, But I found that all the tabs were ticked already, and there a "o" along side, I removed he ticked tabs which I did not need and was replaced with an "o".. After OK;d it I found that in the web page, tabs which I removed and that I had NOT ticked, was the Tabs and the tabs which I did not want was in the web page, In other words the ticked tabs were REVERSED with the non ticked ones. HOW CAN I REREVERSE THE TABS AGAIN?

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jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 25 Contributor
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Hi Hasanat,

Firefox creates numerous session history files, but because session history is only for the immediately previous session, it is unfortunately too easy to lose it. Could you start by making a backup of your existing session history files? Here's how:

Do not exit Firefox, or if you closed it, don't re-open it.

(1) To open your profile folder...

If Firefox is still running:

You can open your current Firefox settings (AKA Firefox profile) folder using either

  • "3-bar" menu button > "?" Help > Troubleshooting Information
  • (menu bar) Help > Troubleshooting Information
  • type or paste about:support in the address bar and press Enter

In the first table on the page, click the "Open Folder" (or "Show in Finder") button.

If Firefox is closed:

Type or paste the following into the Windows Run dialog or the system search box and press Enter to launch Windows Explorer: 

%APPDATA%\Mozilla\Firefox\Profiles

In that folder, do you see a semi-randomly-named folder? If so, click into it. If you find multiple such folders, find the one that was most recently updated.

(2) Copy out session history files

In your profile folder, double-click into the sessionstore-backups folder. Save all files here to a safe location such as your Documents folder.

(3) What files did you find?

The kinds of files you may find among your sessionstore files are:

  • recovery.jsonlz4: the windows and tabs in your currently live Firefox session (or, if Firefox crashed at the last shutdown and is still closed, your last session)
  • recovery.baklz4: a backup copy of recovery.jsonlz4
  • previous.jsonlz4: the windows and tabs in your last Firefox session
  • upgrade.jsonlz4-build_id: the windows and tabs in the Firefox session that was live at the time of your last update
  • various .js files from Firefox 55 or earlier

Could you take a look at what you have and the date/time of the various files to see whether you think any of them would have the missing tabs?

To preview the contents of a file, you can drag and drop it onto this page, then click Scrounge URLs: https://www.jeffersonscher.com/ffu/scrounger.html

That tool is on my site, so please let me know if it doesn't work for you.