Affected versions

• Firefox 81.0b2
• Latest Nightly 82.0a1

Affected platforms

• Windows 10 64bit
• MacOS 10.15.6
• Ubuntu 18.04 64bit

Steps to reproduce

1. Open a pdf with form (eg: https://www.irs.gov/pub/irs-pdf/f1040.pdf)
2. Click inside the pdf so that the yellow notification bar will appear
3. Click the print button inside pdf/Hit CTRL+S
4. Cancel the print action/save action
5. Reload/close the tab with the pdf
6. Click Open With Different Viewer or X button from the yellow notification bar

Expected result

• The buttons from yellow notification bar can be used.

Actual result

• Clicking the buttons from yellow notification bar does nothing.

Regression range

• First bad: 79f9ec2f6fece69848aefefb9300fa3d35aa5593
• Last good: 9877228c87db0fe7f1dd353ff8bc5981f52d8622
• Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=9877228c87db0fe7f1dd353ff8bc5981f52d8622&tochange=79f9ec2f6fece69848aefefb9300fa3d35aa5593
• Potential regressor: Bug 1660617 - Update pdf.js to version 2.6.302 / https://github.com/mozilla/pdf.js/pull/12265

Additional notes

• These are the errors thrown in Browser console:
  InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable PdfjsParent.jsm:276:12
Uncaught DOMException: An attempt was made to use an object that is not, or is no longer, usable PdfjsParent.jsm:276

Suggested severity

• I my opinion this should have the S2 severity since the notification will be stuck on the page and user has to close the tab to get rid of it.

As mentioned on github this isn't a regression, but we should still fix it.