Theme changes may be needed for 33.9.0

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Moonchild
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Theme changes may be needed for 33.9.0

Post by Moonchild » 2025-07-23, 12:57

To give notice to all theme developers/maintainers: Because we're doing a lot of work on CSS parsing, support and computation at the moment, your themes may need more changes than normal for 33.9.0 (slated for 2025-09-23).

Please check your themes for any potential issues with the new release. If necessary I can provide pre-release binaries closer to the release date for testing.

Notable changes so far:
  • Property value overflow: -moz-hidden-unscrollable will no longer be a thing. Use overflow: clip instead, which should be a functional equivalent.
  • Property -moz-user-select is deprecated. Use user-select instead.
  • Pseudo-classes :-moz-read-only and :-moz-read-write are no longer supported. Use :read-only or :read-write, respectively.
(list to be updated more, probably)
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