content/unity-api.js in the unity-firefox-extension extension 2.4.1 for Firefox exposes the toDataURL function in an API call, which allows remote attackers to bypass the Same Origin Policy and obtain sensitive information via a crafted webpage.

Unity integration extension (unity-firefox-extension) before 2.4.1 for Firefox does not properly handle callbacks, which allows remote attackers to cause a denial of service (Firefox crash) and possibly execute arbitrary code via a crafted request.