* The preview pane can be toggled with the editor. Previewing in a popup window is still available.
* Option to automatically update the preview as the editor changes.
* Indicator in the statusbar shows errors. Double-click to display Error Console.
* Option to specify the snippet used to load the editor on startup.
* Option to include a user snippet file. The snippets are merged with the built-in snippets at startup.
* Double-click or drag-and-drop to insert a snippet
* File > New allows user to pick any “Template” snippet, as well as blank.
* Simple XUL Checker can be used to ‘validate’ the XUL snippet. It checks for legal element and attribute names, including allowed attributes for a given element.
* Support attribute value checking where appropriate (boolean and enumerated values) - XUL Checker
* Support “best practice” checks such as: using of commands and keys, strings in DTDs and so on - XUL Checker
* Multi-tabbed editor support
* Support wizards to generate common projects - extensions
* Support extension testing using Firefox extension Test mode
* Venkman support
* DOM Inspector support