When I Leave A Certain Site, It Gives The Message: "The Browser Has Blocked An Attempt To Log Out Of The Application Properly" .
Blocked An Attempt To Log Out Of The Application Properly". How Do I FIX This
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Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the Troubleshoot Firefox issues caused by malware article.
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This can be caused by corrupted cookies or cookies that are blocked (check the permissions on the about:permissions page).
Clear the cache and the cookies from websites that cause problems.
"Clear the Cache":
- Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
- Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"