1746883 - Block OffscreenCanvas on Zoom conference domains

Status: RESOLVED WONTFIX

(Web Compatibility :: Interventions, defect)

Description

[Andrew Osmond [:aosmond] (he/him)]

See bug 1745984 for details, Zoom is broken with OffscreenCanvas and this blocks turning it on by default in nightly to get more feedback.

I believe all we need to do is stub out OffscreenCanvas (e.g. new OffscreenCanvas(width, height) and HTMLCanvasElement.transferControlToOffscreen. It is easily tested by joining a zoom call and observing if you can see video playback from other callers besides yourself.

Comment 1

[Andrew Osmond [:aosmond] (he/him)]

You can turn on OffscreenCanvas by flipping the pref gfx.offscreencanvas.enabled to true

Comment 2

[Andrew Osmond [:aosmond] (he/him)]

Attachment: Bug 1746883 - Block OffscreenCanvas on Zoom conference domains.

While OffscreenCanvas is enabled, it prevents us from viewing the video
of other participants. It does not appear to be a direct bug in Firefox
because Zoom never attempts to use OffscreenCanvas directly. As such, we
will temporarily prevent it from using it so we can enable it for users
on nightly by default.

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/8a3c8d526d39
Block OffscreenCanvas on Zoom conference domains. r=webcompat-reviewers,denschub

Comment 4

[Marian-Vasile Laza]

https://hg.mozilla.org/mozilla-central/rev/8a3c8d526d39

Comment 5

[Cosmin Sabou [:CosminS]]

Backed out changeset 8a3c8d526d39 (bug 1746883) from current nightly (FF98) requested by aosmond as the feature is disabled by default on nightly. : https://hg.mozilla.org/integration/autoland/rev/0cbf4841923901624beb3a430033b138f3f6ec40

Comment 6

[Andrew Osmond [:aosmond] (he/him)]

We no longer need this intervention as Zoom is mostly working with OffscreenCanvas now and we are still turned off by default in nightly in any event.

Comment 7

[Marian-Vasile Laza]

Merged to central: https://hg.mozilla.org/mozilla-central/rev/0cbf4841923901624beb3a430033b138f3f6ec40