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I made a fork with GM_xmlhttpRequest here: https://openuserjs.org/scripts/5310/Steam_Play_Community_Rating_Notice
I suppose that fixed it for you? If so, I'll absorb that change.
The name of the method in the latest Greasemonkey is
GM.xmlhttpRequest
, so this isn't a cross-extension solution. I've only ever tested it on Firefox with GM.I guess you're using Tampermonkey and it didn't work there?
I'm using the GM* methods now, if they're available. That should fix this problem.