1427967 - Extension panels are not scaled correctly on secondary displays where the scale is different to the primary

Status: RESOLVED DUPLICATE of bug 1387340

(WebExtensions :: Frontend, defect)

Description

[jprice21]

Attachment: Firefox_extension_scalling_issue.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0
Build ID: 20171226083017

Steps to reproduce:

On a (Windows 10) system with two screens of different resolutions (and different display scale), the popup panel of firefox extensions don't correctly obey the scaling of the secondary display. As a result, the panels work fine on the primary screen, but are completely cropped on the secondary screen.

Tested with Extensions: LastPass, BitWarden, Ghostery, Nimbus Screenshot, Web Developer, Tab Session Manager, Stylus and a few others - all exhibit the same behavior.

I have a primary screen (laptop) with resolution 1920x1080 and scale of 125% (12" screen),
I have a secondary display with resolution of 1680x1050 and scale 100%.

Extension panels are fine on the primary, but when Firefox is moved to the secondary screen, everything is cropped and controls and functions of the extension can't be accessed.

Screenshot 1: Settings for display 1.
Screenshot 2: Settings for display 2.
Screenshot 3: Firefox with extension panel on display 1.
Screenshot 4: Firefox with extension panel on display 2.

Note, the second Firefox screenshot appears to show a smaller window, but the window has not had its size manually altered, just moved screens and (automatically) re-scaled.


Actual results:

Firefox re-scaled to the correct display resolution and scale of the secondary display, but extension windows do not.
(Section 4 of screenshot)


Expected results:

Firefox and all of it's components and extensions should recognize the scale of the window Firefox is currently in.