Ktorrent/search

Search plug-in
The search tab allows you to edit, remove, or add search engines to KTorrent. After you add your favorite torrent search engine, you can use the search panel (located to the left of the normal KTorrent interface) to search for torrents using your selected search engine.

The external browser section allows you to configure which browser should be opened by default when you do a search and Open External web browser is set. Use default browser will use your computer's default web browser.