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. Enter some text in a random field
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

Expected result

• Save notification message is still there since user did not print/save the page.

Actual result

• Save notification message is not displayed anymore and the data is lost upon reloading/closing the tab

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

• Brendan let me know if I should also log a bug in github for this one.

Suggested severity

• I my opinion this should have the S2 severity since we are dealing with data loss.

This also isn't a regression, see github comment. Would still be good to fix at some point.

The severity field is not set for this bug.
:bdahl, could you have a look please?

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