Weird error with talk.jekyll in firefox

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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