I'm pretty clueless about what else i can do,any suggestion that might help? If it helps i use Avast! antivirus and window firewall,no other software on that pc. I've tried all solutions on the web and on this forum like reset FF, adjust time & date, using the "Skip cert error" add-on, deleting the cert8.db file, and so on - none of them helped me with this problem. I just installed a fresh windows xp on my pc and I'm using the latest FF 26.0,but from the start i cant get to some pages,like in youtube,some pages doesnt come up and i get the "This connection is untrusted" page,in the technical details it says " uses an invalid security certificate,the certificate is not trusted because no issuer chain is provided.(Error code:sec_error_unknown_issuer).Īlso when i open FF add-ons manager tab Extensions,Appearance,Plugins and Services are ok but the Get Add-ons tab is not working,i get the same page as i stated above with the same technical details (instead of it's ) and same error.
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