Cannot connect to all websites

Other browsers may connect to the sites.
When I open my browser, all the sites say connection but never connect.
When I try to restart Firefox, I get a recording error "Firefox is already running, but is unresponsive. To open a new windos, you must first close the existing Firefox, or reestart your system, process"I can fix this in closing the Firefox process in the Contol Panel process, but Firefox still does not connect to the sites.

I have no problem before Firefox version 17

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:

See also:

Tags: Firefox

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