Fix: `-moz-bool-pref` is moved from `@supports` to `@media` #799

[black7375]

Describe the PR

I created a file for nightly.

PR Type

• [ ] Add: Add feature or enhanced.
• [x] Fix: Bug fix or change default values.
• [ ] Clean: Refactoring.
• [ ] Doc: Update docs.

Related Issue

799

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Additional context