Firefox Support Forum

I sometimes receive notification that Fx can't update automatically and I need to download the update. Twice now, the update has deleted my profile on drive D, and replacing it with a new one on the default C: drive. Settings, options, addons all GONE! I finally had to restore my entire system from a backup. What's going on and how can I prevent it happening again?

As above. FF installed the update despite the checked option to NOT install automatically. NO "old firefox" folder was created-anywhere. No other profile is present that has the old data. My adult daughter's grad school laptop. Years of bookmarks, logins and I do not know what all ARE GONE!! I allowed FF to download but NOT INSTALL-since it was not my machine and I wanted to avert any disaster (I, in fact, looked at the options first, to make sure) NOW WHAT?? Is that is a bug?? Why was there no "old FF" created? Why did it install regardless of instructions to the contrary. Is there some other place to look? She does not seem to have any automatic backups for FF profiles.

I cannot install or open firefox because I get a message saying the profile is missing so I try to create a new profile and it says an unexpected error occurred.

I reinstalled it a few times but no luck. I flushed my cache Tried developer edition

This application does not seem to work at all.

I had to hard-reboot my Windows machine, and when I launched Firefox (Developer Edition) upon after boot, my profile was lost. I had to set up Firefox Sync again, browser toolbar settings were reset, extensions were present but all their data was wiped, my session was lost (except oddly for pinned tabs). Windows didn't show any chkdisk activity during boot (looked like a clean boot). I wasn't prompted to create a new profile, so it appears the profile directory still existed. I don't understand what happened, or how I can even diagnose the issue.

Firefox was updating itself on my computer ( not on this iPhone) and in the process all of it disappeared, bookmarks, data, etc. If I try to open it, message appears which says “Profile Missing: Your Firefox profile cannot be loaded. It may be missing or inaccessible”.

I've been using Firefox a long time. Never any problem until immediately after the last automatic update procedure today. Now the application will not load. Instead, I only get an error message "Profile Missing..." (see attached screen shot) I tried downloading the latest version from Mozilla and re-installing. It did not resolve the issue. I still got the same error message.

Computer info: Apple Mac Pro 2009 running OS 10.11.6 El Capitan.

I’m experiencing a repeated problem with Firefox. It hangs after closing. The following happens:

1. ‘Close Firefox’ dialogue box opens, reading: ‘Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window.’

I click ‘Close Firefox’. The the following happens:

2. ‘Profile Missing’ dialogue box opens, reading: ‘Your Firefox profile cannot be loaded. It may be missing or inaccessible’

The above process repeats, even if I create and use a new profile. I cannot close Firefox completely, in Task Manager. Always at least one Firefox remains open as a Background Process. When my laptop is shut down/restarted, Firefox will open once but pages load very slowly, if at all, even in a new profile. Once Firefox is closed (even using ‘Exit’, through the menu), the process repeats. It also takes many attempts to load Firefox Profile Manager.

I am using the most up-to-date Firefox on Windows 8.1.

Steps I have tried: Closing Firefox in Task Manager/Ending Firefox Processes. Restarting computer. Clearing cookies and cache. Restarting Firefox in Safe Mode. Uninstalling and reinstalling. Refreshing Firefox (keeping bookmarks, etc). Creating a new profile. Renaming profiles.ini folder (profilesOLD.ini). Scanned for malware (with Malware Bytes).

Threads that I’ve looked at on support.mozilla.org: Troubleshoot and diagnose Firefox problems Firefox hangs or is not responding - Firefox hangs when you quit it Refresh Firefox – reset add-ons and settings “Firefox is already running but is not responding” error message – How to fix it Support Forum - Task manager won’t close firefox already running but not responding Use the Profile Manager to create and remove Firefox Profiles How to run Firefox when your profile is missing or inaccessible

So far, nothing has resolved the issue, after hours spent trying. Please can someone offer a possible solution?

Thank you.

during a firefox refresh the process failed and firefox no longer worked. I did an uninstall so I could do a fresh install. All attempts to install fresh fail saying "profile" could not be located. So now I have nothing. All my data is missing. I do have a copy of the profile folder, but after the uninstall was performed? contacts, bookmarks, passwords and such all missing ;-( Please help.