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Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

Firefox got hacked and now I can not sign into MSNBC.COM but can sign in to other sites.

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I go to MSNBC for news and commentary. Last week someone got into Firefox and set it so that it minimized every time I hit the "m" button.

 I deleted and installed a new Firefox and ended up with Nightly.  That cured the problem for 2 days, then I became unable to sign in to MSNBC.COM.  It loads and functions perfectly except that I can not sign in. 
 I have tried Internet Explorer several times today and I have signed in repeatedly with it.  It seems that there is a security hole in Firefox.
I go to MSNBC for news and commentary. Last week someone got into Firefox and set it so that it minimized every time I hit the "m" button. I deleted and installed a new Firefox and ended up with Nightly. That cured the problem for 2 days, then I became unable to sign in to MSNBC.COM. It loads and functions perfectly except that I can not sign in. I have tried Internet Explorer several times today and I have signed in repeatedly with it. It seems that there is a security hole in Firefox.

Réiteach roghnaithe

I can sign in again, but did not use your suggested method.

 After repeatedly deleting and reinstalling Nightly failed to fix it I did more reading and followed the appdata trail.  In the firefox folder I found a bunch of sqlitecorrupt files.  Just deleting them did not help but deleting the whole folder did fix it.
 I can now sign in to ALL sites I visit.  Also Nightly is fast!
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It is possible to forget the site in about:permissions. Or by right clicking on the page and selecting "Page Info" click on forget all cookies. Try to sign in again and please report back if this works.

Réiteach Roghnaithe

I can sign in again, but did not use your suggested method.

 After repeatedly deleting and reinstalling Nightly failed to fix it I did more reading and followed the appdata trail.  In the firefox folder I found a bunch of sqlitecorrupt files.  Just deleting them did not help but deleting the whole folder did fix it.
 I can now sign in to ALL sites I visit.  Also Nightly is fast!

Hi miklkit, I am happy to hear this, and I will certainly suggest this if another user runs into this. Thank you . I will mark your post as the solution.