Open with safe mode and tick box, disable all add-ons.

Then click apply and restart, then your normal firefox should open. But you will notice the annoying thing that you havent got any add-ons and if you try to re-instal them it will not work, simply go to tools-add ons, and enable the ones you need.

If you cant open in safe mode, then you already have a firefox.exe process running, go CTRL+ALT+DEL, processs, end task the firefox.exe, then safe mode should open. If oyu have tried opening firefox multiple times, then small 2kb processes run at the bottom waiting for the main one to execute, end tast all of these also.

@WFarr:
Avira is a great product and it’s free too

To Ctrl, alt, delete. Then click on the PROCESS TAB and search for firefox.exe (just look down the list). That’s where to disable it not the Applications where I was looking.

Theres a great product called AVAST! and its FREE ($0.00)

Firefor was not starting up for me. Reinstalling did not help and also the first time I tried this tip it did not work. My problem was whenever I launched firefox, it ised to prompt me for ‘restore previous session’ or ’start a new session’ but nothing happened after that thought there used to be a firefox.exe entry in the task manager.

Before you try this tip, please make sure that you KILL THE FIREFOX INSTANCE FROM THE TASK MANAGER.

Thank you.,
Vinay.

MY SOLUTION:

-So, i double-click the Firefox shortcut on my desktop, but Firefox never starts up. I wait a few minutes to be sure (Firefox usually takes some time to start running anyway)

-I CTRL + ALT + DELETE to open TASK MANAGER
-Find Firefox.exe
-Highlight it
-Click END TASK

-Next thing i do is click START to open start menu
-Go to RUN
-Type in firefox.exe
-Click OK

Again, give it a few minutes- even when Firefox is working, it still takes a little to start up (at least for me it does).

-Sometimes this still doesn’t open it, so i go through the whole process again (END TASK- RUN- FIREFOX.EXE…etc). If it didn’t work that first time, it usually will definitely start up this time- if not, give it one more try. This can get frustrating for sure, but at least you get to use Firefox

SOME WEIRD RANDOM TIPS (that i have noticed- for whatever reason[s], seem to work):

-most importantly, make sure you end ALL PROCESSES of firefox.exe that are running- sometimes i have noticed that i have 2 of them running, and had missed one of them. They all have to be closed out/ended for this to work

-This tip is strange, and it technically makes no sense, but i swear it works. I’ll explain it with an example: Lets say my very first attempt at opening firefox was by double-clicking the desktop shortcut. Then, the second time i use RUN. Then, If there is a third time, i will try another way- say, by clicking the Firefox shortcut located on my START menu- in other words, every time i try to start up Firefox, i use a different method/shortcut. (Sometimes i use RUN the first time, desktop shortcut 2nd time, and so on). Yes, i know- just because they are all LOCATED in different areas, it doesn’t make a damned difference- they are all the same thing- firefox.exe- but seriously, what have you got to lose by doing it anyway? My mind has made me believe that it somehow makes a difference, haha.

-And, lastly, yet another strange thing i have found that helps. Don’t be doing other things while waiting for Firefox to start up. For instance, sometimes i may be in Photoshop working on something. Then, for whatever reason, i need to open Firefox- if i double-click the shortcut or whatever, and then go right back to messing around in Photoshop while Firefox is in the process of trying to start, it almost never starts up. Im not sure why. Even if im like cleaning out folders- or doing ANYTHING really, while Firefox is attempting to get going, it seems to, like, lose focus or something, and won’t start up. I have found that, if i stop doing whatever else it was that i was in the middle of doing, and just wait patiently (bleh!), then Firefox is more likely to start up. Again- no reason as to why, or how, this would affect anything, but it seems to work.

Hope this helps SOMEONE at least , haha. Good luck!