Comment 5 for bug 1547255

For me it's easy to reproduce with installing the SoundCloud scope as there are lots of reviews to scroll down through.

1) Tap the "Install" widget at the top of the "SoundCloud scope" store page.
2) As soon as the progress bar starts to animate, scroll to the bottom of the preview page.
3) Wait for the installation to complete (you'll kinda have to guess when it's done according to your internet connection as there will be no indication).
4) Scroll back up to the top of the preview page.

You'll notice that the top widget is now an empty 0% progress bar.
You'll also notice that there is no "Add a review" edit box visible (this should appear above the "Reviews" section upon successful installation).