Suddenly 39.0 FF is "unable to connect" to any web page

I use almost identical installations of 39.0 FF on both computers Windows 7 Pro. On computer 1, for the last two hours, I got "unable to connect" on each URL I tried. It can access things stored locally, such as troubleshooting information. FF on computer 2 is fine, and Chrome and IE work fine on computer 1.

The problem started watching a movie on Netflix streaming on computer 1. The image suddenly froze and the speakers emitted a wicked repetitive noise - maybe it was 2 seconds of the movie soundtrack play again and again. Commands from the computer totally locked up. I kept only the noise of voltage with power button on the computer. I restarted the computer in safe mode, and then it restarted in normal mode. Now, everything on the computer seems fine - except Firefox.

I tried to restart FF in safe mode; same problem in the corresponding mode. I saved copies of information for troubleshooting in safe and regular mode, and a copy of the submitted crash reports also list. I'll share these if you tell me how. (Can't do it with the button "Share data", of course, because I can't go to this form to ask a question on computer 1 - I am posting this to computer 2)

The only thing I have not tried is "Refresh Firefox". I'd really rather not do that, because it will scan all my modules and customizations.

Would appreciate any help you can offer.

Start the computer in Mode safe mode with network support Windows (on the startup screen, press F8) as a test.

....
You can check problems caused by malware.

Make a check of malware with several malware scanning of programs on the Windows computer.
Please scan with all programs, because each program detects a different malicious program.
All of these programs have free versions.

Make sure that you update each program to get the latest version of their databases before scanning.

Alternatively, you can write a check for an infection rootkit TDSSKiller.

See also:

Tags: Firefox

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