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I deleted some unknown certificates & now cannot access some websites, how can I retrieve the certificates?

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  • Last reply by cor-el

justinpbrown
justinpbrown
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I was looking through all the certificates today & found many that looked dubious to me, from unknown companies in China, Taiwan, Turkey, etc. I 'deleted/distrusted' several of them, although they all seem to have since re-appeared (at least some have for sure). But now I find there are some websites I cannot connect to. I suspect I have deleted part of the trust chain between the website & firefox browser. Is there anything I can do to restore the required certificates?

I was looking through all the certificates today & found many that looked dubious to me, from unknown companies in China, Taiwan, Turkey, etc. I 'deleted/distrusted' several of them, although they all seem to have since re-appeared (at least some have for sure). But now I find there are some websites I cannot connect to. I suspect I have deleted part of the trust chain between the website & firefox browser. Is there anything I can do to restore the required certificates?

Modified by justinpbrown

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cor-el
cor-el
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You can't remove builtin root certificates permanently, but you can remove intermediate certificates (designated as "Software Security Device") that Firefox caches for future use when you visit a website. If you visit a website that doesn't send all required intermediate certificates then you will get an error if Firefox hasn't cached the intermediate certificate from a previous visit.

You can click the blue error code and inspect a base 64 encoded certificate via a website like this: