User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Firefox/91.0

Steps to reproduce:

1. Use an Apple Macbook Pro with M1 Max
2. Install Firefox 96.0.3
3. open Telegram or Discord and receive new messages.

Actual results:

For Telegram, the favicon displays correctly until a new message is received, and then it displays a graphical glitching display with stripes.

On Discord, it just displays a coloured square.

Expected results:

It should display the icon in all circumstances according to application behaviour.

The Bugbug bot thinks this bug should belong to the 'Core::Layout' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

One of our gfx experts suggested to me that the issue might be related to privacy.resistFingerprinting. avbeeri, are you setting the pref or relevant prefs? Also can you please post your about:support result? Thanks!

Ah, yes, I did have that setting enabled, and disabling it fixes it. Apologies if this bug report was spurious.

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