Rated 4 out of 5 stars

With new version 0.1.3, after restarting Firefox after normal install restart, the Add-on Manager does not display, or rather the page is displayed but not the content, the cursor turns indefinitely ... I switched back to Scriptish 0.1 accordingly.

This review is for a previous version of the add-on (0.1.3.1-signed.1-signed). 

This is a race condition that happens for FF < 6, so you can upgrade now, or wait for the next release (which has a fix in it), which I should make soon.