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I have encountered a problem in Mozilla. I am unable to install/uninstall the plugins. I don't why it is happening. :( I am using Ubuntu 12.04. Please help me out

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  • Which plugin/addon were you unable to install/uninstall?
    – saji89
    Dec 12, 2012 at 9:45

2 Answers 2

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(I assume you are using firefox, but most of these troubleshooting steps like safe-mode will work for Thunderbird as well, so they should still be useful)

Don't delete your profile folder straightaway as there's a lot more you can do before you do something like that. There are several ways of resetting your firefox data.

1) Try going to help > troubleshooting and you will see this screen (do not go to about:support without going through the menu or the reset option won't be available):

enter image description here

Just click the reset option and firefox will be returned to its initial state. I have just tested this and it does reset settings and uninstall addons, while retaining your bookmarks.

2) Use the special -safe-mode option to load firefox (this works with Thunderbird as well) Run from terminal,

firefox -safe-mode

You will receive a box like this, which should allow you to load firefox and see if it was an addon that was causing the abnormal behaviour. Restart firefox in safe-mode again a second time and this time click the left-hand reset button if you want to clear your settings and addons.

enter image description here

3) If neither of these suggestions sorts your problem out, you could run profilemanager and create a new profile and run firefox from that.

firefox -ProfileManager -no-remote

enter image description here

Then you could launch firefox like this or create a new shortcut, giving the exact location of your new profile:

firefox -Profile /home/mike/.mozilla/firefox/55divdmr.Mike2 -no-remote

For more on using different profiles in firefox, please see my answer here:

In addition, when you create a new profile, our old profile will not be deleted, so you will still have the data and bookmarks. However, you could set the new profile as your default by placing Default=1 under your desired profile in ~/.mozilla/firefox/profiles.ini.

You could backup your bookmarks to a html file with your old profile by going to firefox > bookmarks > import & backup > export to html. You could then import these when you have launched your new profile.

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Maybe something in you settings folder got corrupt.

You may delete it (you will loose bookmarks, history, saved passwords, extensions).

  1. Close Firefox.
  2. Open Nautilus, press ctrl + H to show hidden folders
  3. Find the .mozilla folder and delete it.
  4. Open Firefox (it should be like a fresh install)

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