1164861 - Firefox scales its interface inconsistently with the GNOME and Unity desktop environments

Status: UNCONFIRMED

(Core :: Layout, defect)

Description

[Alberto Salvia Novella]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0
Build ID: 20150511103303

Steps to reproduce:

CASE 1: NOT SCALING
1. Open the "Firefox" application, and observe the current size of buttons and the start web-page.
2. Close the "Firefox" application.
3. In the "System Settings" application, go to the "Screen Display" section.
4. Set the "Scale for menus and title bars" option to 1.38.
5. Open the "Firefox" application, and observe that the current size of buttons and the start web-page has not been scaled.

CASE 2: SCALING TOO MUCH
1. Open the "Firefox" application.
2. Go to the "Tools --> Add-ons" menu.
3. In the "Get Add-Ons" tab, search for the "Zoom Page" add-on and install it.
4. In the "Extensions" tab, click on the "Zoom Page" add-on preferences button.
5. In the "Zoom Levels" tab, set the "Default Zoom Level (%)" option box to "150".
6. Go to the Firefox start page, and observe that the web-page sized has been scaled a 150%.
7. Go to the "Tools --> Add-ons" menu.
8. In the "Extensions" tab, click on the "Zoom Page" add-on preferences button.
9. In the "Zoom Levels" tab, set the "Default Zoom Level (%)" option box to "100".
10. In the "Extensions" tab, click on the "Zoom Page" add-on remove button.
11. Close the "Firefox" application.
12. In the "System Settings" application, go to the "Screen Display" section.
13. Set the "Scale for menus and title bars" option to 1.38.
14. Open the "Firefox" application, and observe that the current size of buttons and the start web-page has been scaled a 200%, instead of a 150%.


Actual results:

CASE 1: NOT SCALING
The current size of buttons and the start web-page does not scale.

CASE 2: SCALING TOO MUCH
The size of buttons and the start web-page scales a 200%.


Expected results:

CASE 1: NOT SCALING
The current size of buttons and the start web-page to scale a 138%.

CASE 2: SCALING TOO MUCH
The size of buttons and the start web-page to scale a 150%.

Comment 1

[Alberto Salvia Novella]

Also reported to <https://bugs.launchpad.net/firefox/+bug/1455103>.

Comment 2

[Alberto Salvia Novella]

Attachment: Expected.png

Comment 3

[Alberto Salvia Novella]

Attachment: Real.png