Script Summary: Adds a preview button to StumbleUpon forums and inbox.
2.0.2 - Updated to work after a change to site code.
2.0.1 - Fixed a silly bug in the Contact previews.
2.0 - Updated for new Contact interface. Removed unused prefString variables.
1.7 - Added auto-update code. Fixed forum post bug.
1.6 - Restored preview button on Contact pages.
1.5 - Updated following major revisions to StumbleUpon. Previous versions may not work anymore.
1.2 - Added warnings when you navigate away from a drafted post without submitting it.
1.1 - Fixed to work after September 2006 update.
This script cannot automatically access your StumbleUpon user information. In order for your avatar and username to display correctly in the forums you must configure the prefString variable in the userscript by hand. The script will work properly without this information, it just improves the appearance of the preview.
If you would like to disable the warning when you abandon a draft, use about:config to set the "draftWarnings" preference to false.