Why won't Firefox open Yahoo mail or Craigslist correctly; it's corrupted.

For some reason I got a bug or something in my computer and these two sites (that I know of) won't open correctly, they are corrupted. Something like this happened before, but worse where I couldn't open the browser. I went to Internet Explorer and I reinstalled Firefox and it fixed the problem. Not so this time. Hope somebody has some suggestions, I especially don't want to lose all my bookmarks..

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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go to Help Menu -> select "Restart with Add-ons Disabled"
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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.
If you want support for one of your add-ons, you'll need to contact its author.

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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
*Mac: Firefox > Preferences
*Linux: Edit > Preferences

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http://portableapps.com/apps/internet/firefox_portable/localization#legacy
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See "Hang at exit":
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* [[Firefox hangs]]

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See:
*http://kb.mozillazine.org/Browser_will_not_start_up
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Can you post a link to a publicly accessible page that doesn't require authentication (signing on)?
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Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
*Hold down the Shift key and left-click the Reload button
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Command + Shift + R" (Mac)
Clear the cache and cookies only from websites that cause problems.
"Clear the Cache":
*Firefox > Preferences > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox > Preferences > Privacy > Cookies: "Show Cookies"
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).
*Do NOT click the Reset button on the Safe Mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
See also:
*http://kb.mozillazine.org/Error_loading_websites

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I am going by my gut feeling - could be an Adobe Flash problem-
Recent crashes of certain multimedia contents (this includes Youtube videos, certain flash games and other applications) in conjunction with Firefox 13 are most probably caused by a recent Flash 11.3 update and/or a malfunctioning Real Player browser plugin.
In order to remedy the problem, please perform the steps mentioned in these Knowledge Base articles:
[[Flash Plugin - Keep it up to date and troubleshoot problems]]
[[Flash 11.3 crashes]]
[[Flash 11.3 doesn't load video in Firefox]]
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http://forums.adobe.com/thread/1018071?tstart=0
http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html
Please tell us if this helped!

Why won't Firefox open Yahoo mail or Craigslist correctly; it's corrupted.

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