Update Firefox data for appearance: base-select

[KirtiRamchandani]

Summary

Update Firefox compatibility data for appearance: base-select and the single-dropdown customizable select subfeature.

Details

Firefox bug 1974787 was fixed for Firefox 149 and added appearance: base-select behind layout.css.appearance-base-select.enabled. This updates the general base-select value and the single-dropdown subfeature with the corresponding preference flag.

I left the listbox and multiple-dropdown subfeatures unchanged because the Firefox bug documents the customizable <select> value, but does not establish those separate subfeatures.

Tests

• npm run lint -- css/properties/appearance.json
• prettier --check css/properties/appearance.json
• node -e "JSON.parse(require('fs').readFileSync('css/properties/appearance.json','utf8')); console.log('valid json')"
• git diff --check

Related

• https://bugzilla.mozilla.org/show_bug.cgi?id=1974787
• [CSS] Add support for appearance: base-select style value content#44299

[github-actions]

Tip: Review these changes grouped by change (recommended for most PRs), or grouped by feature (for large PRs).

[pepelsbey]

FYI @dletorey