This whitepaper is part two of Web Application Vulnerabilities in Context of Browser Extensions. This particular paper focuses on Opera.
You can download it from the following link: https://packetstormsecurity.com/files/download/100132/browser-extensions2.txt
Source: https://packetstormsecurity.com/files/100132/Web-Application-Vulnerabilities-In-Context-Of-Browser-Extensions-2-Opera.html