Re: I use FireFox at long time. But today FireFox 18 was installed by update system and DON'T RUN anymore om my Windows 7 just block. firstname.lastname@example.org
A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.