I think this is related to https://bugzilla.mozilla.org/show_bug.cgi?id=1673897 : the `actorID` for the response was dropped during serialization because the request was directly returning an array. This was not actually broken because of backward compatibility, for simply because of remote debugging and the way we communicate packets when remote debugging is used. Tentatively closing as duplicate of Bug 1673897, which was fixed in FF85. I don't think we need to do something specific for FF84, and suggest to just accept that request blocking is broken for remote debugging with FF84.
Bug 1683307 Comment 1 Edit History
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I think this is related to https://bugzilla.mozilla.org/show_bug.cgi?id=1673897 : the `actorID` for the response was dropped during serialization because the request was directly returning an array. This was not actually broken because of backward compatibility, but simply because of remote debugging and the way we communicate packets when remote debugging is used. Tentatively closing as duplicate of Bug 1673897, which was fixed in FF85. I don't think we need to do something specific for FF84, and suggest to just accept that request blocking is broken for remote debugging with FF84.