new version not working with thunderbird Rated 5 out of 5 stars

Great extension but after installing version 1.5.1 can't see the 'wear it' button on personas page in thunderbird, each time I click 'wear this persona' it prompts me to install persona's extension over and over again though it's already installed. I went back to version 1.4 and it's working perfectly again. please fix this.

This review is for a previous version of the add-on (1.5.1).