Why won't Firefox open my e-mail page, after clicking the tab, from a Comcast preview page?

I have Comcast.net. From my home page, when I click the email button, first, I must sign-in and then a preview page appears with a short list of emails. When I click the tab to open the entire email page, the entire page does not open as it should. When I click each email on the preview page, each email will not open, as it should, either. This all worked, previously, but stopped working about 3 days ago.

This issue can be caused by corrupted cookies.
Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
* Firefox > Preferences > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove Cookies" from sites causing problems:
* Firefox > Preferences > Privacy > Cookies: "Show Cookies"
* http://kb.mozillazine.org/Menu_differences
*Windows: Firefox (Tools) > Options
*Mac: Firefox > Preferences
*Linux: Edit > Preferences

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Why won't firefox open on my computer even after I re-installed it

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Post on the Microsoft Mac forums since it's their softawre you're having issues with: http://answers.microsoft.com/en-us/mac

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Did Firefox create a new profile?
*http://kb.mozillazine.org/Recovering_a_missing_profile
*https://support.mozilla.org/kb/Recovering+important+data+from+an+old+profile
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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Each time I open my Firefox browser, the tab from the last time opens. I have the browser set to open on my home page, not to the tab from the last time. I keep trying to save the setting for the browser to open on my home page but it doesn't.

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Try to create a new profile as a test to check if your current profile is causing the problems.
See "Basic Troubleshooting: Make a new profile":
*https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile
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*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
Do a malware check with some malware scanning programs on the Windows computer. 
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*http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
*http://www.superantispyware.com/ - SuperAntispyware
*http://www.microsoft.com/security/scanner/en-us/default.aspx - Microsoft Safety Scanner
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Why do I have two icons for iMovie '11 after downloading the update from the App Store? Previously I had iMovie '09.

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Hello,
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#Look for a '''Mozilla Firefox''' folder. If you find one, right-click it and select ''Delete'' and confirm that you want to move the folder to the Recycle Bin.
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This issue can be caused by corrupted cookies.
Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
* Firefox > Preferences > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove Cookies" from sites causing problems:
* Firefox > Preferences > Privacy > Cookies: "Show Cookies"
* http://kb.mozillazine.org/Menu_differences
*Windows: Firefox (Tools) > Options
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*Linux: Edit > Preferences

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Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
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*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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Thanks but perhaps I didn't explain the problem well.
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*Press "Command + Shift + R" (Mac)
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*https://support.mozilla.org/kb/Safe+Mode
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Why won't Firefox open?!

Winglass XP is not letting me open Firefox. I click on it but nothing is actually popping up. I even used the Run command and nothing happens. It always closes whenever I try to open it. Please help!
== This happened ==
Every time Firefox opened
== I was on Winglass XP. ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; MindQuizSearchToolbar 1.1; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET CLR 1.1.4322; AskTB5.6)

Hello Bryan.
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?
Whenever you have a problem with Firefox, whatever it is, you should make sure it's not coming from one of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in [http://support.mozilla.com/en-US/kb/Safe+Mode safe mode] and select ''Disable all add-ons''. If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See [http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes this article] for information about troubleshooting extensions and theme. You can troubleshoot plugins the same way.
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Check that you do not run Firefox as Administrator.
Right-click the Firefox desktop shortcut and choose "Properties".
In the Compatibility tab, make sure that Privilege Level: "Run this program as Administrator" is not selected.
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Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]

Why won't Firefox open my e-mail page, after clicking the tab, from a Comcast preview page?

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