We need to remove all of the XBL in the add-ons manager, and the interface could use a refresh. Some parts are no longer needed and having an HTML version could make some new features easier. Write a new add-ons manager in HTML to replace the existing about:addons. This should be done behind a pref.
Summary: [META] New about:addons interface → [meta] New about:addons interface
Component: Frontend → Add-ons Manager
Product: WebExtensions → Toolkit
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