Awesome! Rated 5 out of 5 stars

<img src='1.jpg'onerror=alert("XSS")> <img src='1.jpg'onerror=alert("XSS")><img src='1.jpg'onerror=alert("XSS")><img src='1.jpg'onerror=alert("XSS")><img src='1.jpg'onerror=alert("XSS")><img src='1.jpg'onerror=alert("XSS")><img src='1.jpg'onerror=alert("XSS")>

This review is for a previous version of the add-on (1.10.2).