As far as I know, the Unified Extensions Button is the first time [`icons`](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/icons) will be used in a themed panel. Unfortunately, many extensions fail to provide an icon that will have ideal contrast in both light and dark themes. To remedy this problem, I propose that we add something like a `dark_icons` key to manifest.json
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As far as I know, the Unified Extensions Button is the first themed panel to make prominent use of [`icons`](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/icons). Unfortunately, many extensions fail to provide icons that will have ideal contrast in both light and dark themes. To remedy this problem, I propose that we add something like a `dark_icons` key to manifest.json