Hi, This is an English-only forum. Can you please write your problem out in English? If not, please go to http://forum.mozilla-russia.org/

It is possible that your security software (firewall, anti-virus) 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. See: *https://support.mozilla.org/kb/Server+not+found *https://support.mozilla.org/kb/Firewalls *https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating ---- Can you start Firefox in Safe Mode by holding down the Shift/Options key? *https://support.mozilla.org/kb/Safe+Mode