Keyconfig extension: SeaMonkey
From MozillaZine Knowledge Base
SeaMonkeyFunctions
Focus Search Bar
Starting with version 2.1, SeaMonkey includes an optional search bar. Currently it has no shortcut assigned. The below adds Ctrl+K (like Firefox) to focus it.
user_pref("keyconfig.main.xxx_key__Focus Search Bar", "control][K][][var el = document.getElementById('searchbar');
if (el) el.focus();][chrome://navigator/content/navigator.xul");