Firefox will not load https (and other websites)

Hello everyone.
I'm running Firefox 18.0 on Windows 7 (64bit). Out of the blue, it started not loading certain webistes. It just spits out blank pages, or does not react when clicking login buttons. The web console will display a GET-message [for facebook: http/1.1. 302 Found 174ms], but hard reloads (CTRL+F5) do not help either.
So far, I have encountered problems with :
- Facebook (blank page)
- Amazon (will not react upon "login")
- GMX (will not react upon "login")
- Mozilla.org (will not let me download Firefox anew OR create a support account)
- My university's library catalogue (will not react upon "login")
- Any of my university's https://-pages
- The Google search in the Firefox task bar.
- EDIT: The e-mail confirmation link this board has send me will not load either.
They will load in Internet Explorer, so here's what I did:
- EVERYTHING from the "Firefox can't load websites, but other browsers can" page, including
Removing and readding FF to my Firewall exceptions,
changing proxy settings,
Dis- and enabling IvP6 settings,
DNS Prefetching,
Clearing cookies, history, browser cache and network cache,
full system scan
- Deleting and Reinstalling Firefox
- Dis- and enabled SPDY in about:config
Please help. I'm at the end of my rope. Thanks.
EDIT: The websites work if I start FF in safe mode. Hope this leads to something.

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!

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