In Firefox, the Luminate Online Page Editor extension adds a pencil icon to the address bar. The icon is only displayed when viewing a Luminate Online page.
The Firefox extension includes luminateEdit.js and luminateEdit-chrome.js, compiled in background.js.
The extension can be downloaded from the Firefox Add-ons site at https://addons.mozilla.org/en-US/firefox/addon/luminate-online-page-editor/.