I would recommend tracking down the person/group that wrote the extension to inquire of them if they are aware of issues with things, not sure anyone on Community is going to be of much help on this as we have no way of even knowing where you got the extension, so we could try to go test ourselves...
The only thing of which I wanted to be sure is you have the extension correctly installed to the QVServer, but you did say things work in a couple of browsers so I am assuming you do. Best I could do is tell you to use the browser dev tools to try to see if you can get some further info that way on the ones not working...
Regards,
Brett
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