[Bug 1843645] [NEW] Tiny UI fonts in Firefox (and Thunderbird) after update in Eoan. General interface font has no effect?

[Mario Vukelic]

Public bug reported:

Firefox 69.0+build2-0ubuntu1
HiDPI display, 3840 x 2160

After a full update on Sept 10 (previously it was fine on Eoan):

- The Firefox UI font is tiny, content is fine.
- Thunderbird is the only other affected application.
- Changing interface font, font size, and font scaling in Gnome Tweaks has no effect on the Firefox/Thunderbird UI fonts, but works elsewhere.
- Changing layout.css.devPixelsPerPx in about:config (either at -1 or positive values like 2.5 or 4) changes the widget size correctly but has no effect on the UI font.
- Changing Scale in Gnome Settings > Devices > Displays > Scale also affects everything except these font sizes

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: eoan hidpi

** Summary changed:

- Tiny UI fonts in Firefox (and Thunderbird) after update in eoan. Maybe doesn't doesn't honour custom interface font?
+ Tiny UI fonts in Firefox (and Thunderbird) after update in Eoan. Maybe doesn't doesn't honor custom interface font?

** Summary changed:

- Tiny UI fonts in Firefox (and Thunderbird) after update in Eoan. Maybe doesn't doesn't honor custom interface font?
+ Tiny UI fonts in Firefox (and Thunderbird) after update in Eoan. Maybe doesn't doesn't honor general interface font?

** Description changed:

  Firefox 69.0+build2-0ubuntu1
  HiDPI display, 2840 x 2160
  
- - The UI font is tiny, content is fine.
+ After a full update on Sept 10 (previously it was fine on Eoan):
+ 
+ - The Firefox UI font is tiny, content is fine.
  - Thunderbird is the only other affected application.
  - Changing interface font, font size, and font scaling in Gnome Tweaks has no effect on the Firefox/Thunderbird UI fonts, but works elsewhere.
  - Changing layout.css.devPixelsPerPx in about:config (either at -1 or positive values like 2.5 or 4) changes the widget size correctly but has no effect on the UI font.
  - Changing Scale in Gnome Settings > Devices > Displays > Scale also affects everything except these font sizes

** Description changed:

  Firefox 69.0+build2-0ubuntu1
- HiDPI display, 2840 x 2160
+ HiDPI display, 3840 x 2160
  
  After a full update on Sept 10 (previously it was fine on Eoan):
  
  - The Firefox UI font is tiny, content is fine.
  - Thunderbird is the only other affected application.
  - Changing interface font, font size, and font scaling in Gnome Tweaks has no effect on the Firefox/Thunderbird UI fonts, but works elsewhere.
  - Changing layout.css.devPixelsPerPx in about:config (either at -1 or positive values like 2.5 or 4) changes the widget size correctly but has no effect on the UI font.
  - Changing Scale in Gnome Settings > Devices > Displays > Scale also affects everything except these font sizes

** Summary changed:

- Tiny UI fonts in Firefox (and Thunderbird) after update in Eoan. Maybe doesn't doesn't honor general interface font?
+ Tiny UI fonts in Firefox (and Thunderbird) after update in Eoan. Maybe doesn't honor general interface font?

** Summary changed:

- Tiny UI fonts in Firefox (and Thunderbird) after update in Eoan. Maybe doesn't honor general interface font?
+ Tiny UI fonts in Firefox (and Thunderbird) after update in Eoan. General interface font has no effect?

** Tags added: hidpi

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Title:
  Tiny UI fonts in Firefox (and Thunderbird) after update in Eoan.
  General interface font has no effect?

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