The Stored Variables Viewer plugin was a plugin that gave me great satisfaction when I completed it. It became popular quite rapidly. This version is now compatible with Firefox 5 and Selenium IDE v1.1. It is now searchable using the find toolbar at the bottom of the pane. It also includes some refactoring to bring improvements from my latest plugins. You will get it automatically when AMO approves it. If you want it right now, you can get it directly from the version page on AMO.
More releases for this one are on the way soon.