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Firefox error on MacOS when accessing Google: NS_ERROR_DOM_COOP_FAILED

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andrei.dascalu.eng
andrei.dascalu.eng
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About 50% of times when I'm trying to perform a Google search, I'm getting an error page saying "Blocked Page: An error occurred during a connection to www.google.com."

It always happens first on performing a search, regardless of content (eg: "Liverpool Milan 2005") The network tab says "NS_ERROR_DOM_COOP_FAILED"

It only ever happens on Google (and only with Firefox) and it seems temporary, though it can take hours to apparently fix itself. At the same time, any other browser (Chrome, Safari) works ok with the same query.

About 50% of times when I'm trying to perform a Google search, I'm getting an error page saying "Blocked Page: An error occurred during a connection to www.google.com." It always happens first on performing a search, regardless of content (eg: "Liverpool Milan 2005") The network tab says "NS_ERROR_DOM_COOP_FAILED" It only ever happens on Google (and only with Firefox) and it seems temporary, though it can take hours to apparently fix itself. At the same time, any other browser (Chrome, Safari) works ok with the same query.