Firefox will not quit when closed.

I have two problems with Firefox. It "hangs up" after a couple of minutes and will not quit and when I go to restart my computer, I now have to manually close some windows to get the computer to restart.
I was on Firefox 3 something and Firefox would go along nicely for about 10 minutes and then hang. The computer wasn't frozen - it just hung and you couldn't go to any other pages or connect to any other links.
I upgraded to Firefox 7. Same problem. I upgraded to the latest version of Flash player. Same problem. I uninstalled the latest version of Flash player, reinstalled the earlier version, and then gave up when nothing changed and reinstalled the latest version again. That's the first problem.
The other problem is that when the Foxfire window hangs and you close it down, Forefox is still running in the background and nothing, I mean nothing, not the Task Manager, but nothing will close it except rebooting the computer. If you restart, you get window that says nsAppShell:Event W... and you have to manually close that window to restart your computer and it takes for freaking ever.
I have done everything I can think of and everything that has been suggested, as far as I know. I have uninstalled Firefox 7 and reinstalled it again. I have deleted the parent.lock file (yes, I remembered to delete it when I reinstalled FF7 again). I have checked every extension and plugin I have. I don't have many, but I did check them all. Doesn't matter whether they're disabled or not, Firefox still hangs up, although sometimes I get the nsAppShell window again and sometimes I don't. If I disable one plugin, I will not get the nsAppShell, but then the next time with everything else the same and that plugin still disabled, I will get it again. Now I'm getting a window about fonts that needs to be manually closed before I can restart the computer.
I'm at the end of my rope. I love Firefox, but tomorrow for the first time in 6 years, I'm going to another browser because I need to be able to use my computer. You guys have no idea how absolutely frustrating this is. I'm having to use IE right now and I hate IE. But if I can't use Firefox, what else can I do?
By the way, my computer worked fine all day yesterday. Last night there were some Microsoft updates that went in automatically when I shut down. Maybe it's those? But there is one other thing I saw and that was that Grease Monkey was updated today. Now I disabled Grease Monkey and still got the nsAppShell window and Firefox still hung up. So I uninstalled and reinstalled that too, and it still didn't make a difference either way. But maybe it has something to do with it, although I wouldn't know how to fix it if disabling Grease Monkey won't fix the problem.
OK, post script: I closed Firefox down about an hour ago or more ago and couldn't get it to quit again. I decided to not restart the computer again, so I just left it go and went to IE. I just now, for a lark, tried to restart Firefox and it did restart, but it's taken an hour to do that. I went to another page and it hung up again. So I don't know, but I have to be able to be able to use my computer and right now that's impossible using FIrefox.

OK, I think I have this solved. After reading my post over, I decided to rethink the problem. First thing I did was download Chrome and I tried using that and IE again and surprise! I was having the same problem on those browsers as well. So now we know it wasn't Firefox. I then figured maybe a slow computer meant a virus, so I ran scans. I've had both Avast and IOBit for months now and I've never had a problem with either of them before. Then I downloaded Malwarebytes and ran a third scan. They all picked some stuff up, but nothing serious. Then I tried disabling all the antivirus stuff and that didn't solve anything. But then I decided to keep Malwarebytes and I uninstalled IOBit Security and whammo - problem solved.
I have no idea why out of the blue IOBit would be causing a problem like this so if someone knows, please let me in on the secret. Additionally, IE was working fairly well last night but not this morning. I also don't know why removing IOBit would take care of the nsAppShell issue, because supposedly, that's related to Firefox plug ins. And one more thing...when Comcast hooked my neighbor up to cable, they did it by putting a splitter on my line. They were messing about with the lines yesterday before I got on my computer last night trying to decide how to rerun them and today they did that, taking the splitter off my line and giving my neighbor his own line. That was finished about 30 minutes before I uninstalled IOBit. So....who knows?
But I ain't about to look a gift horse in the mouth. I have my Firefox back and I am so sorry for bad mouthing you last night - I love you, Firefox!

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Firefox will not quit when closed.

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