Watch out for "Firefox security" at your Mozilla Firefox add-ons
If you go to Tools / Add-ons menu (might be calling them "Plugins" or "Extensions", don't remember the exact English text there) at Mozilla FireFox, do you see one called "Firefox security" there with subtitle "Internal security options editor."? If so, then uninstall it immediately, it's Trojan JS/Dursg.C or a variant. See more info at the JS/Dursg.C
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