A new version of Clipmarks for Firefox was recently made live on our site. This version has a number of improvements (many of which were requested or brought to our attention by our users...thank you all so much for the great feedback).
Mozilla.org has not yet made this updated version of Clipmarks available on their site. There are some pretty substantial differences between the two so i strongly recommend installing Clipmarks from our site for now to get the latest.
FYI...there are some cool new things coming to the site soon...i'll keep you posted shortly.