Add browser_style.css #5
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Copied from https://github.com/mozilla/gecko-dev/blob/338230dfeb14c047b55228a21b3e49657f00ae83/browser/components/extensions/extension.css
This is the unmodified CSS file that gets included in Firefox in WebExtension Manifest V2 addons, when they choose to use
browser_style: true
browser_style: true
is removed in Manifest V3, therefore addons need a replacement. One quick fix is to include this CSS file locally.See also #4