Firefox is set as my default browser but will not open. I can access other browsers

Firefox crashed while I was browsing. I re-started the LT and now Firefox will not start. I have tried re-starting from the desktop, the tool bar and the start menu.I can use other browsers which are not my default browser eg Googlechrome. This is not the first time Firefox has crashed but is the first time it would not re-start. I have looked through the Firefox support page but potential solutions require Firefox to be open to access the Firefox toolbar.
NB. I am an IT dummy (seriously) ie I have no idea what a plug-in is so the simpler the better when explaining what I am doing wrong. Thanks

Hopefully this support article is what you need:
http://support.mozilla.com/en-US/kb/How+to+set+the+home+page

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What version of Windows and Office is it? I had this issue with an older version of office and Windows XP. Basically, MS are using their browser (IE) because it's their software (MS Office). If you go to options in MS word though, you should be able to find an option to set the default browser to open links.

Why do email hyperlinks open a new ff browser, but will not open the link?

'''''''''XPSP3 & FF3.6 & Outlook2003''''''''' : When I click on a hyperlink in outlook, a fresh occurence of ff opens (even though ff is already open) but the link will not open. This used to work before I upgraded to ff4.0, so I rolled back to 3.6 and still have the same problem. All the file type suggestions have been executed, but still no success. Can anyone offer any help?

The '''SearchToolbar/1.2''' that messed with your UserAgent might be the cause of that problem. Try some troubleshooting.
Do you have that problem when running in the Firefox SafeMode? 
[http://support.mozilla.com/en-US/kb/Safe+Mode] 
''Don't select anything right now, just use "Continue in SafeMode."''
If not, see this: 
[http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes]

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Sorry that this is long, but I wanted to make sure you knew as much as you needed to know.
I click on the icon in my Windows taskbar, and the firefox browser window will not open.
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<pre>ReaditLater
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PriceBlink
StumbleUpon
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See http://kb.mozillazine.org/Browser_will_not_start_up
Create a new profile as a test to check if your current profile is causing the problems.
See [[Basic Troubleshooting#Make_a_new_profile|Basic Troubleshooting: Make a new profile]]
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins"
If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files) 
See http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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Hmmmm, strange you view YouTube in Safari & not FF. Which version of FF are you using?
Try the following:
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Make sure you have the latest versions of Adobe Flash Player Software
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Sounds like it is hanging when you exit and later try to restart Firefox.
* How to stop the running Firefox process
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** See: http://kb.mozillazine.org/Kill_application
**Windows 7 users: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
* What may cause Firefox to hang at exit
**Windows 7 Task Manager: http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576
** http://support.mozilla.com/en-US/kb/Firefox+hangs
** http://kb.mozillazine.org/Firefox_hangs
** https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding
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*** http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
*** http://support.mozilla.com/en-US/kb/Basic+Troubleshooting
 
 
'''You need to update the following:'''
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#*https://www-trunk.stage.mozilla.com/en-US/plugincheck/
#*'''Note: plugin check page does not have information on all plugin versions'''
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#**http://kb.mozillazine.org/Testing_plugins
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#**Use IE to go to the above site to update the IE ActiveX
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Firefox hangs and will not allow me to access other programs running when I resize a pop up window, move a pop up window, accidentally right click flash content.

Firefox hangs and will not allow me to access other programs running when I resize a pop up window, move a pop up window, accidentally right click flash content.
== This happened ==
A few times a week
== Not sure when it statrted

Hi.
When this happens, please press CTRL+SHIFT+ESC and see how much RAM and CPU Firefox is using. If they're sky high, then... Well, that kind of issues are, unfortunately, more common and the we'd like. Thankfully, 99% of the cases are very easy to solve. However, you do need to diagnose what your exact problem is. Do this:
#run Firefox in safe-mode to disable all extensions and plugins. If this fixes your issues, be them with RAM or CPU usage, then you know it's a problem with plugins or extensions. Proceed to number 2. If safe-mode doesn't fix the issues, then read bellow, after this list;
#update all extensions and plugins in your Firefox. If this doesn't solve the issues, proceed to the following number;
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#you're done! You've fixed your problems with problematic add-ons.
Ok, if disabling all extensions and plugins through safe-mode didn't work to bring Firefox's CPU and RAM usage to good levels, then you have different issue. The most likely scenario is that you have a third party software running on your computer that is messing with Firefox. Do as follows:
#do a virus/malware check on your computer. If this doesn't fix it, proceed;
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#check your firewall/antivirus/security suite for enabled functions/features that you don't want and/or may be conflicting with Firefox. You'll find that these features are most likely tied to Internet Security features, such as link scanners or URL checkers and the like. If you're not sure they are conflicting with Firefox, simply try to disable to see whether or not that's true. As long as you don't browse the web with your antivirus completely off and your firewall completely turned off, there should be no problems. If this doesn't solve the issues, proceed to the following number;
#check your operating system security options, mainly advanced options that are not configured by default. While it's very unlikely that this may be the cause of the problem (after all, it's the last item on the list), it's remotely possible. If this doesn't do it, I'm out of ideas. Except make sure you've followed my instructions correctly.

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Create a new profile as a test to check if your current profile is causing the problems. 
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*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
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*http://kb.mozillazine.org/Profile_backup
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cactisken
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Thank you.
ATR

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