Mine

Error: uncaught exception: [Exception... "'Illegal value' when calling method: [nsISidebar::addSearchEngine]"  nsresult: "0x80070057 (NS_ERROR_ILLEGAL_VALUE)"  location: "JS frame :: javascript:window.sidebar.addSearchEngine('file:///home/aguthrie/downloads/hollywood.src', 'http://www.google.com/favicon.ico', 'foo', 0) :: <TOP_LEVEL> :: line 1"  data: no]

Error: [Exception... "'Illegal value' when calling method: [nsISidebar::addSearchEngine]"  nsresult: "0x80070057 (NS_ERROR_ILLEGAL_VALUE)"  location: "JS frame :: javascript:window.sidebar.addSearchEngine('file:///home/aguthrie/downloads/hollywood.src', 'http://www.google.com/favicon.ico', 'foo', 0) :: <TOP_LEVEL> :: line 1"  data: no]
Source File: javascript:window.sidebar.addSearchEngine('file:///home/aguthrie/downloads/hollywood.src', 'http://www.google.com/favicon.ico', 'foo', 0)
Line: 1