Firefox Community Forum

I had to replace my hard drive recently, and with it my Firefox install. I managed to transfer everything over to the new install, except for the URLs in Reading List. The extension itself made it over; just not any of the URLs I stored in it.

In theory, I know that I can scrounge through the Firefox install on my old hard drive and grab the necessary files, but I have no idea how I'd go about doing that. I can't rely on folder names, since those are based on extension IDs that are generated when I install the extension, and the files themselves are too opaque to glean anything useful from (Notepad++ didn't turn anything up, so I'm assuming the extension data's compressed).

Other than that, I've tried:

• Running this tool to see if there was anything I could use. There wasn't.
• Trying Load Temporary Add-ons to identify the Add-on I wanted. I accidentally erased my feeds on RSS Feed Reader doing this, so there's another extension whose data I need to restore. (It was fine before I tried Load Temporary Add-ons.)

As of yesterday, Oct. 14, 2025, everything in my Firefox Bookmarks and History is gone. This is the message displayed: "The bookmarks and history system will not be functional because one of Firefox's files is in use by another application. Some security software can cause this problem." I have tried to recover them by different suggested means, but it would appear there is NOTHING to recover. Everything in Bookmarks says EMPTY, and I can no longer save any new Bookmarks, it just not allowed. How and why did this happen, and what am I supposed to do? I had hundreds of things Bookmarked, many of them were important to how I run my business, and now are seemingly all gone. This is very upsetting and would appreciate Mozilla getting this straighten out. I need and explanation and resolution.

Fedora froze and I had to reset my PC. Firefox hat quite a number of tabs open wich are still visible in history Recently closed tabs. When I click there on Reopen all tabs nothing happens.

How do I open all recently closed tabs?

On my linux system, I have two users. If I log in as user A and use FF and leave a bunch of tabs open, I can view those tabs again later if I restart my computer and log in as user A, so FF remembers its history.

No Problem Scenario Logged in as A - open FF - open a bunch of tabs - CLOSE FF log out of A log in as B - do stuff log out of B log in as A - open FF; all the tabs are there

Problem Scenario Logged in as A - open FF - open a bunch of tabs - leave FF open (don't close FF before...) log out of A log in as B - do stuff log out of B log in as A - open FF; all the tabs are GONE

If I run into the Problem Scenario, I can sometimes use these steps to get the history/tabs back. https://support.mozilla.org/en-US/kb/how-restore-browsing-session-backup

Whether the steps work or not, the Problem Scenario is annoying. I don't know what causes this. My desktop manager is KDE.