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Thanks for answering,

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

这个评论是针对附加组件的一个早期版本的(0.5.5)。 

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).

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Not compatible with vesion 57 :(
Do you have in your plans to make it to work with FF 57?

这个评论是针对附加组件的一个早期版本的(0.5.5)。 

Last time I checked styling menuitems/buttons wasn't allowed with WebExtensions :(