- Go to LXR
- Access SeaMonkey
- Search for the label 'Find in This Page...'
- Found entity called 'findOnCmd.label'
- Do a search on 'findOnCmd.label'
- Found menuitem id 'menu_find'
- Do a search on 'menu_find'
- Found command 'Browser:Find'
- Do a search on 'Browser:Find'
- Found that '/suite/browser/navigatorOverlay.xul' is where the find bar is defined.