Firefox Support about immersive-web-emulator HOT 3 OPEN

Besides the lack of background service worker support in Firefox, there is another issue. The MAIN ExecutionWorld isn't supported by Firefox yet, which the extension uses to inject the webxr-polyfill. See: https://bugzilla.mozilla.org/show_bug.cgi?id=1736575

It's relatively straightforward to get something working as the background service worker can be swapped out for a background event page/script (I believe that is Firefox only when used with Manifest v3) and injecting the webxr-polyfill.js into the document from a content script instead of as as content script.

I created a fork with the above two changes and it seems to work surprisingly well. 🙂
There is only one minor inconvenience. The execution of the polyfill script isn't guaranteed to be before the other scripts on a page, so a page might conclude that WebXR isn't supported. Setting dom.vr.webxr.enabled to true in about:config effectively works around this issue as the page either detects the "real" WebXR API or the polyfill, but once you enter an immersive session it uses the polyfill
Link to the fork: https://github.com/mrxz/immersive-web-emulator

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Per discussion on Discord, it appears the blocker in Firefox is support for background service workers for Manifest V3 https://bugzilla.mozilla.org/show_bug.cgi?id=1573659

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any idea when this will happen?

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