This is the third release candidate of Clippings 5.1. This fixes an issue with the sizing of the extension preferences dialog on Mac OS X, as well a cosmetic issue affecting the Clippings status bar icon in Thunderbird.
Because this is not an official release, like the preceding beta
releases, Clippings 5.1rc3 will not be available as an automatic upgrade.
Read the blog post for Clippings 5.1 release candidate 1 for details on what's new, how to get it, and how to get help and support.