Figma cursors appear to be corrupt on dot browser

[trickypr]

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• [x] I have read the Contributing Guidelines for this project.
• [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.

Component privacy.resistFingerprinting

Describe the bug When using figma, large parts of the site display in a way that looks like there is serious corruption happening.

To Reproduce Steps to reproduce the behavior:

1. Go to Figma
2. Click on open this file: https://www.figma.com/file/v0LYuyR8nkhrqNbesl5cyT/DotHQ?node-id=0%3A1
3. Observe

Expected behavior This should render as it does on regular firefox

Screenshots

System Information (please complete the following information):

• OS: Manjaro
• Version: idk

Dot Browser Information (please complete the following information):

• Version: Nightly 87.0-715616008
• Site you were on before the bug appeared: Figma

Additional context A canvas security popup appeared, I do not know if that is in any way related. This doesn't appear to be present on ff nightly.