I want to help users change privacy settings in a third party web application.
My first thought was loading the web application in an iframe and interacting with it via JavaScript. But the same-origin policy would prohibit that.
To avoid the same-origin restriction I could use a web proxy, but I doubt many users would trust logging in.
I could build a browser extension, but that makes it more cumbersome to use and harder to support all browsers.
Any suggestions?