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Bug 1642404 - add an option to show that an update is being downloaded r=bytesized,fluent-reviewers,flod Add support for a hidden preference named app.update.notifyDuringDownload that, when set to true, causes a "Downloading update" message to appear in the app menu during a MAR download. Clicking the message opens the about box so the user can see detailed progress information. Differential Revision: https://phabricator.services.mozilla.com/D77688
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