%APPDATA%\Mozilla\Firefox\Profiles\xxxxxxxx.default\searchpluginswhere xxxx is a random string. 3. Create a new file in the searchplugins directory called picitup.xml with the contents below: The icon file is usually called favicon.ico and is found on the level of the homepage. However, in this case it is present in a different directory, which I found by viewing the HTML source of the Picitup homepage:
<link rel="SHORTCUT ICON" href="images/plusico/fav.ico">To find the search URL, look at the HTML <form> element:
There is detailed documentation about the OpenSearch format at OpenSearch.org and with reference to Firefox at the Mozilla Developer Center.