When I want to open talk.jekyllrb.com in Mozilla, I see this error
any Idea?
You might want to take a look at this issue.
The solution proposed by @ parkr on the last comment worked for me.
Close the browser and remove references to talk.jekyllrb.com on
~/.mozilla/firefox/aabbccdd.default/SiteSecurityServiceState.txt
For Mac users:
/Users/[username]/Library/Application Support/Firefox/Profiles/[random].default
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