[Bug 298474] New: font appearance changes in Firefox and Thunderbird after opening widget style settings

[Pascal R.]

https://bugs.kde.org/show_bug.cgi?id=298474

            Bug ID: 298474
          Severity: major
           Version: 1.0
          Priority: NOR
          Assignee: unassigned-bugs at kde.org
           Summary: font appearance changes in Firefox and Thunderbird
                    after opening widget style settings
    Classification: Unclassified
                OS: Linux
          Reporter: pascal at setvisual.de
          Hardware: Ubuntu Packages
            Status: UNCONFIRMED
         Component: general
           Product: systemsettings

I am using Kubuntu 12.04 and tested this in a fresh user account.

After entering every subcategory in the Systemsettings for Application
Appearance (on my german system "Erscheinungsbild von Anwendungen") the font
appearance in Firefox and Thunderbird changes (the antialialising looks really
bad).

I did not klick on the "Apply" ("Anwenden") button. Just opened Systemsettings
> Application Appearance and klicked "Colors", "Symbols", "Fonts", "GTK+
Appearance", "Emoticons" one after each other. After that I restarted Firefox
and Thunderbird and now the fonts are looking ugly even after a reboot.

Reproducible: Always

Steps to Reproduce:
GUI Names could be wrong because I translated them back from the german names.
1. Create a new user
2. Login to KDE as the new user
3. Start firefox
4. Make a Screenshot of e.g. the top black menu bar on google pages
5. Open "Systemsettings"
6. Select "Application Appearance"
7. Select "Colors", "Symbols", "Fonts", "GTK+ Appearance", "Emoticons"
8. Close the "Systemsettings" window
9. Restart Firefox
10. Make the same screenshot in Firefox and compare it to the one made in step
4.
Actual Results:  
The font's appearance of the first and the second screenshot differs (the
second looks somehow dirty).

Expected Results:  
The font's appearance should not have changed because I changed no setting.

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