I just uploaded a new version of Groundspeed to the Mozilla Add-on (AMO) site. The new version, 1.2, has some small updates to increase stability and to correct some bugs. I also submited this version to ‘full review’ by Mozilla, what should give Groundspeed access to all functionality in the add-ons site (no more warnings that the add-on might not be safe when installing!).
Once the review is passed, people using older versions of Groundspeed will be automatically prompted to update as part of the browser update process.