The Capture URL dialog lets you capture the name and the URL of the current page in the Internet tab to add it to the list of pattern URLs accessible in the Internet tab.
If the URL contains your test search string, it is recommended that you replace that string with a %s. For example, if you go to www.dictionary.com , search for “call” and then select Capture URL you will get the following value in URL:
http://dictionary.reference.com/browse/call
You will notice that the word “call” appears in the URL above. You can now change it to %s in order to obtain the URL for generic searches:
http://dictionary.reference.com/browse/%s
You can enter a descriptive name for this URL in the Name field.
By clicking OK, the entry is added to the URL list in Tools->Settings->Internet.