Firefox is hanging constantly

Hello there,
I am running Firefox 4.0 on a Macbook Pro running the latest OS X. Recently after installing the new Firefox I have had a recurring problem every single time I load Firefox up. It loads my two home pages and responds normally for 30 seconds but then will hang leaving the page frozen and unresponsive only displaying firefox in the tool bar (all other options disappear) with the only way to close the window being to close firefox completely. I have to minimise the page then open a new window and the new window functions normally. If I immediately close the first window then the new window will crash, closing tabs or changing home pages, clearing cache, cookies and the like makes no difference either.
Is there any way to stop the first window hanging so I can use firefox without having to open another window. I uninstalled and reinstalled an older version but the problem remains. I have only had this problem since I first upgraded to firefox 4.0, before that firefox worked like a dream.

Thank you for the help! However, I do not think it worked
I made a TXT file named
mms.cfg
and entered
ProtectedMode=0
in it. I put that file here
C:\Windows\System32\Macromed\Flash
Then I opened Firefox. I opened a yahoo mail account. I t quickly hanged and, in about 60 seconds, i had three each of
FlashPlayerPlugin_11_7_700_224
and
plugin-container (plugin-container.exe *32 to be precise).
Any further help will be greatly appreciated.
Cheers,
Kail

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Video Graphics Intel HD Graphics
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thank you

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Description:
A problem caused this program to stop interacting with Windows.
Problem signature:
Problem Event Name: AppHangB1
Application Name: firefox.exe
Application Version: 10.0.0.4411
Application Timestamp: 4f2548ce
Hang Signature: 4813
Hang Type: 0
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 2057
Additional Hang Signature 1: 4813d58d219b01045ae1404b21f04466
Additional Hang Signature 2: ec05
Additional Hang Signature 3: ec057c79f467a3033cec4ebe11500204
Additional Hang Signature 4: 4813
Additional Hang Signature 5: 4813d58d219b01045ae1404b21f04466
Additional Hang Signature 6: ec05
Additional Hang Signature 7: ec057c79f467a3033cec4ebe11500204

-> Provide your Crash IDs by using the suggestions mentioned in the following article:
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== This happened ==
Every time Firefox opened

Hello.
You may be having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
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Firefox is hanging every time I open a Google Map

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Peace

''Peace712 wrote:''
Although the problem goes away when I use Firefox in safe mode. What could be the problem here?
Try toggling the status of hardware acceleration under Options → Advanced → General, then restart Firefox.
* [[Advanced settings for accessibility, browsing, system defaults, network, updates, and encryption|Advanced settings for… hardware acceleration]]
If there's no problem in Safe Mode, that suggests an issue with an add-on, a preference or a file in the profile, or hardware acceleration. Since you've already ruled out the other two, hardware acceleration is all that's left to try.
* [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]]
''Peace712 wrote:''
Can anyone confirm that this is a Firefox bug and has been fixed in V29?
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''Feel free to vote for the report to keep track of any progress, but please don't post comments unless you have technical information to add. See [https://bugzilla.mozilla.org/page.cgi?id=etiquette.html the Bugzilla etiquette page] for details.''
* [https://bugzilla.mozilla.org/show_bug.cgi?id=1026409 Bug 1026409] - Can't print to XPS - Printer Error - An error occurred while printing
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* [https://bugzilla.mozilla.org/show_bug.cgi?id=875691 Bug 875691] - FireFox 29.0 Still Does Not Work Correctly with the Adobe Acrobat 10.1.9 PDF Printer Driver
I use Doro PDF Writer, which works fine.
* http://thesz.diecru.eu/content/doro.php

Firefox is hanging constantly

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