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Server Certificates - is it okay to delete unknown and what is the impact?

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Smegatron
Smegatron
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Have recently been review my privacy settings in more detail and have stumbled upon the following via Privacy & Security>View Certificates>Servers

Can anyone please explain to me in idiots terminology what these are, what they do, and should I keep or delete them?

Have recently been review my privacy settings in more detail and have stumbled upon the following via Privacy & Security>View Certificates>Servers Can anyone please explain to me in idiots terminology what these are, what they do, and should I keep or delete them?
Attached screenshots

Réiteach roghnaithe

I suggest you leave them in as if deleted you cut your connection to the web off as they are needed to talk/make requests to other servers. https://support.mozilla.org/en-US/kb/secure-website-certificate

Please let us know if this solved your issue or if need further assistance.

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Shadow110
Shadow110
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Réiteach Roghnaithe

I suggest you leave them in as if deleted you cut your connection to the web off as they are needed to talk/make requests to other servers. https://support.mozilla.org/en-US/kb/secure-website-certificate

Please let us know if this solved your issue or if need further assistance.

Smegatron
Smegatron Úinéir na ceiste
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Thanks! So the x3 certifcates on my screenshot are okay? I've read that the cm9.net server relates to sky broadband hubs & routers? I cancelled that service several years back so wondered what it was...

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cor-el
cor-el
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Your screenshot shows permanent block exceptions on the Server tab for certificates that shouldn't be trusted anymore. You shouldn't remove these exceptions.