STR: 1. With a build that has properly working autoplay blocked click-to-play button, like when bug 1487143 is fixed. 2. Open up https://alastor0325.github.io/htmltests/autoplay_tests/autoplay_test2.html 3. Verify that the play button shows up 4. Kill the app from the task manager 5. Launch the app again. The same tab should load Expected: 1. the play button shows up Actual: 1. the play button only shows up if you reload the page again. Note: 1. I checked |hg annotate| and it seems that CastingApps.js has always been loaded lazily. I assume this bug always exists so I didn't try to fix it in bug 1487143.