wasm: declarative-camera fails to show camera

Declarative-camera fails on webassembly:

(firefox)

 
10:35:38.519 Camera permission is not granted! qtloader.js:389:25
10:35:38.519 QQmlComponent: Component destroyed while completion pending qtloader.js:389:25
10:35:38.527 Autoplay is only allowed when approved by the user, the site is activated by the user, or media is muted. qtloader.js line 461 > eval line 9 > Function:4:25
10:35:38.529
Uncaught (in promise) TypeError: can't access property "getVideoTracks", handle is null

Permissions work on Chrome on my own wasm-camera test app, but not in declarative-camera
 

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I think this might be a permissions thing for autoplay?