Browser Configuration/Opera

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opera snapshot 9.6 build 2436 has native shared qt theming. install this version and set skin to native qt and opera will use your qt theme just like all other applications too

This tutorial explains how to configure Opera so that it will look like the rest of your KDE applications. To do this, we'll need to install the Opera Oxygen Project skin, set Opera to use KDE's color scheme, and change Opera's default fonts to the ones which KDE uses.

Please note: This tutorial is written for Opera 9.5 or later. Make sure that you're using KDE's default icon theme, Oxygen, since the Opera Oxygen Project skin uses icons from Oxygen.

Step 1: Installing the Skin

Open Opera and navigate to the following link:

http://my.opera.com/community/customize/skins/info/?id=8141

Click "Download Skin" to install the Opera Oxygen Project skin.

Step 2: Applying the Skin & Changing the Color Scheme

Go to Tools -> Appearance.

In the "Skins" box, you will see a list of all the skins that are currently installed. Click on "opera_oxygen_project_[version]" to apply the Opera Oxygen Project skin to Opera.

Click on the menu box next to "Color Scheme" and select "System Color Scheme" to let Opera use KDE's color scheme.

Step 3: Changing the Font

Go to Tools -> Preferences. Click on the "Web Pages" tab.

Opera has two default fonts - the normal font and the monospace font. You can change these default fonts by clicking on them. Change the normal font to DejaVu Sans and change the monospace font to DejaVu Sans Mono.

That's it! Now Opera will look and feel just like your other KDE applications.

Source

This tutorial is based on Patrick Trettenbrein's blog entry entitled “How to make Opera 9.5 look native in KDE 4”.