0. Intro.
It’s no secret that Firefox under KDE looks really clumsy, even with qtcurve styles. I do not know how anyone, but I personally want all the applications in my DE to look the same. Therefore, taking up this issue, I tried a bunch of styles for the gnome (gtk styles tab in systemsettings) and plug-ins for firefox.
1. Solution.
But as close as possible in the kde I could only integrate with this plug-in:
https://addons.mozilla.org/ru/firefox/addon/59338/ - full support for qt4 styles! The browser is not distinguishable from other programs kde.
https://addons.mozilla.org/ru/firefox/addon/12196 - firefox notifications are shown via plasma-notify
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As a result, the browser looks like this:



Plus, in order for file dialogs to appear too, you need to turn off the value ui.allow_platform_file_picker (set to false) in about: config.
2. Outro.
Still, subjectively, it seems that the interface began to work an order of magnitude faster.
Minuses:
- the controls on the pages still look the same.