Firefox opens in task manager but does not display.

This morning my Firefox stopped working and I had to end task. Afterwards when trying to restart Firefox the firefox process will open under task manager but nothing displays on the screen. I've tried ending all firefox processes and restarting my pc. I also tried creating a new profile under the firefox,exe -manageprofile command. When I created the new profile and ran under it I had the exact same problem. I tried running under safe mode and I get the pop up telling me that mozila is running under safe mode with the check box's for clearing settings but there is still no window displayed and when clicking continue in safe mode the pop up box goes away and I'm left with nothing once again. I tried running the firefox setup freshly downloaded in an attempt to repair the setup of sorts but this had no effect.
I also did a short search of the forum for any soloutions but so far haven't found anything. If anyone could suggest some more things to try before I do a complete wipe of Firefox using CCleaner.
Also in the event I use CCleaner I'd like to back up my bookmarks first so if anyone knows a start parameter to back up bookmarks or even what file the bookmarks are stored (already found a forum topic on the saved passwords file) in and if copying that file into a new installation will work please let me know.
Regards to any one who can assist.

I had this problem for a couple weeks as well and it was extremely frustrating considering we use firefox for all our company tasks. Here is the solution:
First of all if you have no bookmarks you want to save, then go directly to step 7. If you want to save your bookmarks first, then follow these steps.
1. Shut down the computer
2. Reboot and open firefox
3. Go to Task Manager, right click firefox.exe, and click END PROCESS TREE
4. WAIT 30 SECONDS! Then Double-click the shortcut to try and open firefox again
5.Repeat steps 3 and 4 until firefox finally opens (trust me, eventually it will)
6. Once it finally opens, backup your bookmarks,
7. Download a copy of firefox from there website
8. Uninstall from programs menu and make sure to check the box REMOVE ALL COMPONENTS
9. install the new copy and BOOM! it works
If it doesn't work, you're an idiot. If you don't want to reinstall firefox, then you're out of luck. Good Luck!

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