Emilio Cobos Álvarez 56e23db6d4 Bug 1744749 - Use windowUtils.canvasBackgroundColor to get the web extension background. r=extension-reviewers,robwu ...

Make popup browsers non-transparent so that we can get a meaningful
canvas background-color from layout. I don't think it matters since
popups are not meaningfully transparent since bug 1449933.

Depends on D133772

Differential Revision: https://phabricator.services.mozilla.com/D133773

2021-12-16 14:56:33 +00:00

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