Take the 2-minute tour ×  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  share|improve this question Which plugin/addon were you
unable to install/uninstall? –  saji89 Dec 12 '12 at 9:45 add
comment  2 Answers  (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 you