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Firefox Theme Development - Use a background image in toolbar

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I am developing a new theme for Mozilla Firefox.

  • The toolbar (including tab_selected) uses a background image (background.png)
  • Other areas in the frame uses a solid color (black).

Can I create such a manifest.json? So far I have referred to

MDN web docks: theme https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/theme

I am developing a new theme for Mozilla Firefox. * The toolbar (including tab_selected) uses a background image (background.png) * Other areas in the frame uses a solid color (black). Can I create such a manifest.json? So far I have referred to MDN web docks: theme https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/theme

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Try to ask advice at the Discourse Add-ons website.