There isn't any documentation that I can find on what "NS_ERROR_DOM_COOP_FAILED" means, but it seems like it was a transient glitch.



745 # Used to indicate that a resource load was blocked because of the
746 # Cross-Origin-Opener-Policy response header.
747 #
748 errors["NS_ERROR_DOM_COOP_FAILED"] = FAILURE(1041)


Most interestingly, Firefox source code seems to indexed by a handful of SEO-infested source code indexing sites, but not by the major search engines, at least not with enough relevance. 🤔

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