404. That’s an error.

The requested URL /translate_c?depth=1&rurl=translate.google.ru&sl=en&sp=nmt4&tl=ru&u=https://addons.mozilla.org/en-US/firefox/addon/onetab/&xid=17259,15700022,15700043,15700186,15700191,15700256,15700259,15700262,15700265,15700271&usg=ALkJrhgJFQiomAaXE_oDb9cl7Lo8gV4T0w was not found on this server. That’s all we know.