Rated 4 out of 5 stars

This was a brave attempt to bypass one of the unilateral UI changes in a once (2.x and 3.x) nice browser UI. Unfortunately "padlock" has the same problem as "share-me-not", its icon ends up in an illegal position at the right end of the status bar (now adds-on bar), where it can't be accessed in manual "customizations". Wild guess after trying to grok one XPI archive: Maybe something in the extension developer manual was not as it should be, and some extensions tried to use the same global "right end of status bar" id instead of creating their own id.