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Running WebRTC in Web Developer Responsive Design Mode doesn't seem to work - e.g. https://mozilla.github.io/webrtc-landing/gum_test.html

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All WebRTC examples that I have found on the Internet that work in standard Firefox Web Developer mode don't seem to work when Responsive Design Mode is switched on. I can take simple standard examples like https://mozilla.github.io/webrtc-landing/gum_test.html or https://webrtc.github.io/samples/src/content/getusermedia/gum/ and run ok as a standard web page or with Web Developer Tools on but not when I then turn Responsive Design Mode on. If I turn it off and try again all is good.

I have spent ages searching the Internet to try and find some answers and can't find anything that seems related and yet I would have thought a large number of people developing WebRTC would have been using RDM. Is there some switch or config that I am missing?

I am running Firefox Quantum 61.0.2 (64-bit) on Windows 10 10.0.17134.

Many thanks, I am scratching my head on this one.

Rgds, Katie

All WebRTC examples that I have found on the Internet that work in standard Firefox Web Developer mode don't seem to work when Responsive Design Mode is switched on. I can take simple standard examples like https://mozilla.github.io/webrtc-landing/gum_test.html or https://webrtc.github.io/samples/src/content/getusermedia/gum/ and run ok as a standard web page or with Web Developer Tools on but not when I then turn Responsive Design Mode on. If I turn it off and try again all is good. I have spent ages searching the Internet to try and find some answers and can't find anything that seems related and yet I would have thought a large number of people developing WebRTC would have been using RDM. Is there some switch or config that I am missing? I am running Firefox Quantum 61.0.2 (64-bit) on Windows 10 10.0.17134. Many thanks, I am scratching my head on this one. Rgds, Katie