Discovered today with https://marketplace.firefox.com/app/epubreader/ In the Firefox OS Marketplace app: 1. Navigate to an installed app's info page. 2. Note launch button. 3. long-press 'home' to get to launcher screen. 4. long-press app's icon to enter edit mode. 5. remove app. 6. re-open marketplace app. The info page still says "Launch" rather than "Free" for the app. And tapping the launch button has no effect.