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It likely means an instance of firefox is still running (perhaps it crashed on your last use, rather than exiting properly). So, run the command "killall firefox" (without quotes). Your system should have a way to enter commands, via a menu choice at a start button, or something. If not, open a terminal, and enter the command there, or press Alt-F2, and a box should appear where you can enter commands. Enter the command "killall firefox". Then, you should have no problem opening firefox.
If you still have problems, rebooting would clear things up.
Oh, wait, I think I misread your question. I thought you were having problems opening firefox, but it appears you can open firefox, but can't connect to the internet? Well, maybe my above suggestion will help anyway.
Last edited by mark_alfred; 07-26-2009 at 02:53 PM.
If this is still a problem after a reboot, then it would indicate that the lock file that FF should delete after installing an Add-On has not been removed after a (successful) install - the killall command should remove the lock file, but occasionally, it doesn't.
To remove the file manually open up a terminal window and issue the command cd ~/.mozilla/firefox. Within this directory will be a directory unique to the user. To find out the name of this directory issue the command ls. The directory will be a random string of characters. Mine, for example, is u6n8y834.default. Change into this directory and issue the command ls. You should now see a file called lock. Issue the command rm lock to remove this file. Firefox should now start up.
Tried both above but when I put in killallfirefox a run errormessage appears saying "failed to execute child process "killallfirefox"(no such file or directory)
When I try the manual removal and put cd etc into the terminal window the words "No such file or directory" appear.
..but when I put in killallfirefox a run error message appears ..
Not "killallfirefox", but rather "killall firefox" (it's two words, not one).
Also, as and235100 mentioned, perhaps "killall firefox-bin" would work.
However, I'm surprised that rebooting did not work. So, I'm not really sure what to suggest, actually. Can you connect to the internet with its other applications? For instance, can you connect to the internet using the messenger (it uses pigeon, I think)?
If I use su and killallfirefoxin the command window that appears when I press alt F2then it flashes and nothing else happens. If I put this in a terminal then the message that appears is su: user killallfirefox does not exist.
Thanks for the help so far.