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There are some problems using Firefox in Kubuntu.

  • The menus are ugly and do not use the KDE style.
  • The file browser for uploading or opening files is also ugly, and is not the default KDE mini-file-browser.
  • The filetype icons are not shown correctly in the Downloads window.
  • In the small Downloads window, if I right-click a file and select "Open Containing Folder", nothing happens.

gtk3-engines-oxygen is installed and "oxygen-gtk" is the default GTK style in System Settings > Application Appearance > GTK.

Here's an example of what it looks like:

enter image description here Something tells me I am missing something to integrate Firefox into KDE. What can I do to get Flamewolf - ahem Firefox to integrate nicely with KDE?

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2 Answers 2

Reset to default
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The first thing when you install KDE Distro is to install gtk3-engines-oxygen.

sudo apt-get install gtk3-engines-oxygen

Then re-apply gtk settings in System Settings/Application Appearance/GTK

re-select a GTK2 Theme: oxygen-gtk

re-select a GTK3 Theme: oxygen-gtk

and click apply...

Then every program include Firefox should appear correctly.

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    Apparently gtk3-engines-oxygen was already installed and also selected in GTK themes. Thank you, though.
    – Richard
    Mar 13, 2014 at 14:43
  • Do you have such problems with other programs? Last time I have installed Kubuntu, gtk3-engines wasn't pre-installed and all my programs had similar problems.
    – m1nev
    Mar 13, 2014 at 19:59
  • Yeah, the same thing happens with LibreOffice and a couple other programs like UNetbootin.
    – Richard
    Mar 13, 2014 at 21:51
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I would add the Blue System's PPA for Firefox integration, as recommended straight from MMartin Gräßlin, KWin's main developer. Link: Firefox KDE integration in Debian Testing

The Launchpad PPA page for Blue Shell's Firefox can be found here: firefox-kde

Note that two packages need to be installed: firefox, and firefox-kde-suport

This will lead to a better experience, as shown in the picture from Martin's blog post. The reason this is not installed by default in Kubuntu is that Kubuntu tries to maintain a "pure" KDE experience, and therefore rarely alters upstream packages. And since Firefox is not a KDE application, upstream (KDE) would have no interest in supporting Firefox. This is the best answer for how to handle integration with Firefox + KDE in Kubuntu.

Editorial: If more people file bugs on the matter, maybe it can be addressed. Esp. since Firefox is the default browser now for Kubuntu 14.04, which is a LTS.

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  • Yes, this is largely a bug in Firefox , as Mr. Gräßlin points out. Thank you.
    – Richard
    Mar 14, 2014 at 18:41

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