Firefox opens as a transparent window in W7 64-bit. even in safe mode - how to fix this?

W7 64 bit Firefox suddenly began opening as a transparent window, only a corner of the Red Cross. Tried to re-downloadiing and reinstall and same issue.
Tried to start in safe mode
Have restarted computer
Can run Google Chrome (don't want to use IE so quickly had chrome) without any problems and have not changed anything on the computer before it stopped working or well after.
Latest windows updates have been more than a week and firefox worked fine after that.
I recently did an AV scan with deleted threats but once again Firefox worked after that and after several start/stop after that.
A week before the show, I edited beginning until via MSCONFIG to stop some unwanted programs run at startup - again, several reboots and stops since then with Firefox works with success every day.

One possible cause is security software (firewall, antivirus) that prevents or limits Firefox or plugin-container process without informing you, possibly after the detection of changes (update) for the Firefox program.

Delete all rules for Firefox and the plugin-container in the permissions list in the firewall and leave your firewall again ask permission to get full unlimited access to the internet for Firefox and the plugin-container and the update process.

See:

Tags: Firefox

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