1532635 - devtools-toolbox is displayed empty after reopening the tab inspected in a new window

Status: NEW

(DevTools :: about:debugging, defect, P3)

Description

[Hani Yacoub, Desktop QA]

Attachment: devtools toolbox.png

[Affected versions]:
Nightly 67.0a1

[Affected platforms]:
Platforms: Windows 10 x 64, Mac OS X 10.14, and Ubuntu 16.04 x64.

[Steps to reproduce]:

1. In about:config set:
   • devtools.aboutdebugging.network -> true
   • devtools.aboutdebugging.new-enabled -> true
2. Go to about:debugging or to about:debugging-new
3. Click on "This Firefox".
4. Make sure to have many tabs opened and they are displayed unde "Tab" section (ex. reddit.com).
5. Click on "Inspect" button beside reddit.com
6. A new tab is opened with the Browser Toolbox.
7. Drag and drop reddit.com tab to open it in a new window.

[ Expected result]:
devtools-toolbox should be correctly displayed with all the sections and tabs.

[Actual result]:
devtools-toolbox is displayed empty after reopening the tab inspected in a new window.

Comment 1

[Julian Descottes [:jdescottes]]

STRs have slightly changed. We now hide Tab debug targets by default when debugging This Nightly/This Firefox. You need to set devtools.aboutdebugging.local-tab-debugging to true to have them displayed again.

[Actual result] should slightly change after Bug 1505368 lands.
"devtools-toolbox is displayed empty after reopening the tab inspected in a new window."
should become -> "devtools-toolbox shows an error message"

The issue is that when you drag a tab in another window, the tab is recreated. You can see that if you:

• open a tab
• open DevTools in this tab
• drag the tab out to create a new window
  DevTools will be closed.

The issue here is similar. Since tab debugging on This Nightly/This Firefox is off by default and this can't be reproduced on mobile devices, fixing this should not be high priority.