If you already have an older version of Panic Button installed, it will be upgraded for you if automatic extension updates are enabled. Otherwise, open Extension Manager (Tools → Add-ons), then right-click on the entry for Panic Button in the list of installed extensions and choose Find Update.
What's New
- Compatible with Firefox 20 and newer. Fixed missing toolbar icon issue that was present in Firefox 20 beta releases
- Bug fix: Restore Session toolbar shows black-colored space below the toolbar content on Mac OS X
Questions and comments about Panic Button should be directed to the AE Creations forums, now hosted on Google Groups.