[Affected versions]:

• Firefox 54.0a2 (Build ID: 20170321004003)
• Page Shot 5.2.2026

[Affected Platforms]:

• All Windows
• All Mac
• All Linux

[Prerequisites]:

• The "xpinstall.signatures.required" is set to "false" and latest Page Shot (5.2.2026) custom build is installed on a new clean profile.

[Steps to reproduce]:

1. Open Firefox with the profile from prerequisites and navigate to any website.
2. Click on the "Page Shot" button from the main toolbar
3. Perform a selection on the website and click the "Download" button.
4. Cancel the download window and click again the "Download" button
5. Observe the browser behavior.

[Expected result]:

• The download window is opened.

[Actual result]:

• The download window is not opened, nothing happens.

[Notes:]

• If the selection is moved 1 pixel, then the download button works again.
• The old behavior on Page Shot Test Pilot version, after the "Save" buttons was clicked, the Page Shot overlay was dismissed.
• Here is a screen recording with the issue: