1496381 - Tab preview is black on first Ctrl+Tab

Status: RESOLVED DUPLICATE of bug 1293692

(Firefox :: Tabbed Browser, defect)

Description

[Jens]

Attachment: black_preview_on_first_ctrl+tab.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0

Steps to reproduce:

1. Enable "Ctrl+Tab cycles through tabs in recently used order" in options
2. Open a few new tabs with Middle-clicking on some links. Could be any site, but I used https://www.heise.de/ and middle-clicked on some articles there so they open in new tabs
3. Press Ctrl+Tab


Actual results:

Preview of tabs is not shown, the preview is just a *black* screen.


Expected results:

Preview of tabs should show the preview.

Happens only on first Ctrl+Tab. If I release the keys, then do Ctrl+Tab again, then it's working.

I see this bug in Firefox 64 (Nightly) and Firefox 62 (release).

See screenshot.