1362219 - With a Dual Monitors configuration, Full screen always opens on the primary monitor

Status: UNCONFIRMED

(Core :: Widget: Gtk, defect, P3)

Description

[Sèvegrand]

Attachment: Capture du 2017-05-05 00-41-48.png

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:53.0) Gecko/20100101 Firefox/53.0
Build ID: 20170418123315

Steps to reproduce:

I use a dual boot (Windows 10 - Ubuntu 16-04) and a dual monitors configuration
I watch TV on SFR TV, (SFR is my Internet provider, Web, TV and Phone.), 
The actual page with SFR TV is open on my secondary screen. 
(see picture joined). 



Actual results:

I am on the Ubuntu platform; when I want to visualize the transmission full screen and clic on the icon, the new window  always opens on the primary screen, whatever the screen where the initial window is open.



Expected results:

I hope the full screen video stay on the monitor where the initial window is opened.
In that case, on the second one!
The problem doesn't happen :
 - With Chrome under ubuntu, 
 - With firefox on the same platform with Windows 10
In this two configuration of use, full screen stay on the monitor where the initial window is opened.

Comment 1

[apenner.it]

The same bug reproduce on MacOS 10.15.4, with Firefox 75.
Steps to reproduce:

• Two monitor setup
• move youtube tab to secondary monitor
• click open in full screen
  Result: video will pop-up on a primary monitor

Comment 2

[JS]

Same here,
OSX Catalina 10.15.7
Firefox Developer 86.0b9 (64-bit)

1. Full screen video will goes to the first screen. and follow the size of the second screen.
2. Tooltips (html title attribute) will be showed on the first screen as well.

Comment 3

[JS]

Attachment: Screen Shot.png