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I upgraded from 11.10 to 12.04, now when I try to run Firefox from the icon it pops up this: "Missing Profile. Your Firefox profile cannot be loaded. It may be missed or inaccessible." I already tried to remove Firefox and re-installing it. And the command "sudo chown -R $USER:$USER ~/.mozilla". I've also tried to delete the profile file, or renaming it. I've found some solved problems but they didn't work for me. Maybe I should mention that if I run Firefox from terminal using "sudo" it starts fine. Any idea about how could I solve this?

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Well, I've solved it by the moment. I realize that before I upgraded, Firefox was in the version 20.0.1; after upgrading, Firefox is v21.0.0. I've read that Firefox v21 wasn't stable in Linux yet. And maybe that was the trouble, so I downloaded the version 20.0.1 and (I don't know exactly how to install it) ran the file 'firefox-bin' after uninstall the other version and delete de .mozilla folder. It worked! But now Firefox doesn't have is characteristic icon! Can someone tell me to wich folder should I move the Firefox folder (I mean the one that comes in the .tar file)? –  Luis J. Romero Jun 1 '13 at 19:23

5 Answers 5

I got the same case, and I tried to change permission of mozilla cache and it worked:

root mode

sudo -s

chown -hR $USER:$USER ~/.cache/mozilla

but after I changed, there's pop-up suggested me when I opened firefox to create a new profile. I just want to use an older profile. So I changed the permission of old profile too into my user!

chown $USER:$USER ~/.mozilla/firefox/profiles.ini

dont forget to make a sure the file permission is changed :)

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Thanks, I will try it, thought, I solved it with the first answer of this question: askubuntu.com/questions/303228/… I realize that the problem is with Firefox 21. I installed an old version (20.0.1) and it worked. Maybe now I can update to FF 21 and try what you say. –  Luis J. Romero Jun 5 '13 at 2:45

Try deleting the current profile. That will force Firefox to create a new profile. Profile folders are located here:

~/.mozilla/firefox/<profile folder> 

The .mozilla folder is a hidden folder. Make sure that you check show hidden files in your file manager (Browser).

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I just encountered this in 14.04 after an attempt to move files from my previous install failed. I am no expert, but this worked: Edited profiles.ini file in ~/.mozilla/firefox/ commented out (using ; below)

;Path=[this.is.a.hash].default

Created a new path line so that the hash matched the [this.is.a.hash].default folder name in ~/.mozilla/firefox/

Maybe I could have renamed the folder to match the name in profiles.ini, but easier to trace back the problem knowing I could delete the new and uncomment the old Path= from within profiles.ini.

Fortunately for me, I installed 14.04 on a new SSD and kept the old 12.x release. Now I'll try what I should have done in the first place - a proper Firefox profile backup/move from the old installation.

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I had the same problem after upgrading to Firefox 23.0. Deleting the profile folder didn't work and i tryed a lot of other tipps found in various forums.

But changing the owner of the cachfolder finaly did the trick. Thanks

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Thank you for your answer, but can you explain how to change the owner of the folder? –  mrcktz Sep 10 '13 at 10:05

Had a similar issue. Had to delete the profiles.ini file in ~/.mozilla/firefox/. Tried all kinds of permissions solutions to no avail. Once profiles.ini was deleted, firefox created a new profile.

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