Klipper offers "actions" for it.
As precondition Klipper needs to be active and must be visible as a tray icon in the panel.
Call up thedialog and add action:
Regular expression for action:
Now you need to add two commands for added action:
Command 1 (all on one line):
kfmclient openURL "http://www.dastelefonbuch.de/?pid=OpenSearch&cmd=search&kw=%s&le=de"Description for command 1:
Phonebook search, Konqueror
Command 2 (all on one line):Description for command 2:
Phonebook search, Firefox
After that it should look like this:
After highlighting a phone number on a web site a small window appears und you will be prompted to select an action. See screenshot at beginning of page.