I’m in the process of updating my extensions to support Firefox 3. Unfortunately, there were some significant changes in how extensions can be served. So, at this point, only my Next Image plugin is working. Also, it might not show up via the Add-ons manager “Find Update”, so please install it directly.
Project Page: http://www.mrchucho.net/pages/projects#nextimage
Direct Link: http://www.mrchucho.net/downloads/nextimage-0.9.xpi
Updated – My second extension, This Window, is now up-to-date and available, too.
Project Page: http://www.mrchucho.net/pages/projects#thiswindow
Direct Link: http://www.mrchucho.net/downloads/thiswindow-0.8.xpi