Bug 1659300 Comment 0 Edit History

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**Affected versions**
* 81.0a1 (BuildId:20200815093117)

**Affected platforms**
* Windows 10 64bit
* macOS 10.14
* Ubuntu 18.04 64bit ( I believe that Ubuntu is affected as well.. Will get back with a confirmation on Monday).

**Preconditions**
* Ensure that the `print.tab_modal.enabled` pref is set to `true`

**Steps to reproduce**
1. Launch Firefox.
2. Access the following [link](https://en.wikipedia.org/wiki/United_States).
3. Open the print preview.
4. Fastly switch between “Fit to page” & scale radio buttons. (Also try switching to different orientation options while doing this).

**Expected result**
* The print preview updates successfully.

**Actual result**
*  The system dialog gets open & “An error occurred while printing” error message is displayed.

**Regression Range**
* This seems to be a regression:
* Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=4e6b4ef959560877408e46d85db19011b1ca5efe&tochange=5b4faf8f838301f19d6350f477dfd080ee6aeea8
* Potential Regressor: Bug 1657911

**Notes**
* The following error is outputted inside the browser console: 
`TypeError: can't access property "hasAttribute", tab is undefinedLinkHandlerParent.jsm:46:15`
* For further information regarding this issue please observe the attached screencast.
* [Suggested Severity] S2
**Affected versions**
* 81.0a1 (BuildId:20200815093117)

**Affected platforms**
* Windows 10 64bit
* macOS 10.14
* Ubuntu 18.04 64bit

**Preconditions**
* Ensure that the `print.tab_modal.enabled` pref is set to `true`

**Steps to reproduce**
1. Launch Firefox.
2. Access the following [link](https://en.wikipedia.org/wiki/United_States).
3. Open the print preview.
4. Fastly switch between “Fit to page” & scale radio buttons. (Also try switching to different orientation options while doing this).

**Expected result**
* The print preview updates successfully.

**Actual result**
*  The system dialog gets open & “An error occurred while printing” error message is displayed.

**Regression Range**
* This seems to be a regression:
* Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=4e6b4ef959560877408e46d85db19011b1ca5efe&tochange=5b4faf8f838301f19d6350f477dfd080ee6aeea8
* Potential Regressor: Bug 1657911

**Notes**
* The following error is outputted inside the browser console: 
`TypeError: can't access property "hasAttribute", tab is undefinedLinkHandlerParent.jsm:46:15`
* For further information regarding this issue please observe the attached screencast.
* [Suggested Severity] S2

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