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由 SoCu 发表于 Oct. 14, 2017 ·

Thanks for answering,

Do you have in your plans to make it to work with FF 57?

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作者 ChoGGi (开发者) 日期 Oct. 15, 2017 ·

If the WebExtensions API doesn't support it, nothing I can do.

As long as FF keeps support for UserChrome.css, you can still manually add the CSS (just stick the mosaic in the same folder as userchrome.css).