Firefox 4.0b10 will randomly lock up and say (Not Responding) in the title bar, and sometimes takes 1min to become usable again.

Most of the time when I launch Firefox 4.0b10 it will hang for 30sec-1min before loading. It will show a white page and say (Not Responding) in the title bar.
It also does this when opening a new tab, clicking any link, and sometimes scrolling down a page.
'''Thread locked as a duplicate of [https://support.mozilla.com/en-US/questions/780167 questions/780167]

My McCaffee was a trial thing, I think. I clicked on it to see if it was updated, and it said it was expired. So I'm just going to uninstall it completely and install AdAware, which is all I've ever used for years and never had a problem.
It occurs to me -- this must (?) have something to do with my new computer... it was slow right out of the box, and I called ASUS tech support the second day I had the puter up and running, and the tech asked me to do a System File Check (SFC), but discovered that the normal pathways through which one would do a SFC (according to him) did not work - the machine would not either recognize them or it would simply swallow the command and then just do nothing... he put me on hold for a few minutes. He came back with a workaround (don't remember it exactly, but it involved a DOS prompt), and I was able to finally run a SFC, which revealed "corrupted files" that had to be "repaired."
In a brand new computer? That can't be a good thing... Maybe the system software factory install was just a bad install? Because I had some slow Firefox issues on my old machine (Acer, dual core, 4gRAM, 2009 machine), but NOTHING like this. This is getting very frustrating. I'm used to just sitting down to my computer and using it, not sitting down and fighting with it for 2 or 3 minutes or more before i can do anything.

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My computer lingo is not the best. Is this what a crash is when this happens? When this happens Firefox does allow me to quit. I have no add -ons.

You are not alone Morganbai, Iv the exact same trouble. Iv also tried firefox 7 beta and have the exact same trouble. Please Please someone help us

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When I open Firefox, it goes to the first page I open, but then stops and says "Not Responding" with the mouse cursor spinning. I hit the close button and it says Windows is searching for a solution (which doesn't come).
When I open Firefox again, it says:
Well, this is embarrassing.
Firefox is having trouble recovering your windows and tabs. This is usually caused by a recently opened web page.
You can try:
Removing one or more tabs that you think may be causing the problem
Starting an entirely new browsing session
Any ideas? I gretly appreciate any help. Thanks!!

What is that first page?
Can't you open any web pages in Firefox?
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).
*Don't click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

Firefox won't open when prompted the first time. Says "Not Responding". I have to hit cntrl/alt/del then try starting again. Sometimes multiple times.

Firefox won't open when prompted the first time. Says "Not Responding". I have to hit cntrl/alt/del then try starting again. Sometimes multiple times.

Sounds like a "hang at exit" problem. There are several possible causes for that error. See:
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** In Task Manager, does firefox.exe show in the '''Processes''' tab?
** See: http://kb.mozillazine.org/Kill_application
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** http://support.mozilla.com/en-US/kb/Firefox+hangs (see "Hang at exit" section)
** http://kb.mozillazine.org/Firefox_hangs
** https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding
* You may need to try Firefox Safe Mode
** You may need to use '''Safe Mode''' to locate the problem: http://support.mozilla.com/en-US/kb/Safe+Mode
**Firefox Safe Mode is a diagnostic mode that disables Extensions and some other features of Firefox. If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes '''before''' starting Safe Mode. When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode". Test to see if the problem you are experiencing is corrected.
** If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it by enabling '''one at a time''' until the problem reappears. '''You MUST close and restart Firefox after EACH change''' via File > Restart Firefox (on Mac: Firefox > Quit). You can use "Disable all add-ons" on the Safe mode start window.
** See the following for more information
*** http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes
*** http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
*** http://support.mozilla.com/en-US/kb/Basic+Troubleshooting

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When I start FF it application hangs (freezes) some times over a minute. Message say FF is not responding. . Have had my PC checked, it is clean, cleared the cache and performed everything else I can think of. When I click to change pages, it does the same thing.

Does everything else on your computer work as expected, is it only firefox that you have a problem with ?
If so Try Firefox in [[safe mode]]
# do not make changes in the first options window, just click on continue.
# use only the default theme
# if you still have problems, then whilst still in safe mode, disable your plugins
* see [[troubleshooting extensions and themes]]
Try firefox on a file on the local computer, eg save a web page and open it on your harddrive with firefox, presumably that works ok without giving messages of not responding.
Also
*are you using Firefox 8 and the problem computer to send these posts ?
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You are not alone Morganbai, Iv the exact same trouble. Iv also tried firefox 7 beta and have the exact same trouble. Please Please someone help us

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Update all your plugins (Flash, Java, etc.): [http://www.mozilla.org/plugincheck/ http://www.mozilla.org/plugincheck/].
Download and Install MalwareBytes Anti-Malware, run a full Scan. [http://www.malwarebytes.org/ http://www.malwarebytes.org/]. This helps check that there are no viruses on your computer causing issues. you can uninstall this program after you clean off any infections.
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Hey cor-el,
Wow. That did it. You are a genius! Thank you, thank you. It's very important that I be able to use the folders with saved bookmarks feature for my business which I rely on daily.
I unchecked the "use hardware acceleration feature" where you said it was in Firefox 9 browser and it resolved the problem immediately. I am using an Nvidia GS8400 video card. I was having the same problem on the new ATI/AMD video cards too (haven't tested though on ATI computer yet). My Matrox M9120 doesn't do that at all though. Do you have any idea why that is ? Is it a software conflict between Nvidia or AMD drivers and Firefox?
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Firefox 4.0b10 will randomly lock up and say (Not Responding) in the title bar, and sometimes takes 1min to become usable again.

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