Increasing a browser's JavaScript authorization level?

I am currently developing an internal tool and I have a vague memory of a method to prompt for elevated permissions in scripts, allowing cross-site requests if approved. Given that this tool is meant for internal use, this feature could potentially solve a problem I am facing.

Is there anyone who knows how to achieve this?

More specifically, my goal is to retrieve the content of third-party tracking iframes injected into our webpage using JavaScript in order to gather performance analytics data. Since these iframes come from different domains, simply proxying them would distort the accuracy of the information, making that option unfavorable.

javascriptxss

Answer №1

There isn't a direct way to prompt for elevated permission in your script, but you can detect it and advise the user to adjust their browser security settings if necessary.

For more information on customizable security policies, Mozilla.org offers an informative article:

If your goal is simply to bypass the same origin policy, alternative methods like using a server-side proxy can be employed.

Answer №2

When it comes to Firefox/Mozilla, the function you are looking for is 

netscape.security.PrivilegeManager.enablePrivilege()
, as referenced in this related query.

To enable cross-site AJAX, you will need the UniversalBrowserRead privilege. I have used this privilege to create a local file system for a basic stock-ticker page that retrieves data from Yahoo's Finance service. The browser prompts the user the first time they visit the page to grant the privilege. Once granted, it remains active until the browser is restarted and the same page is revisited.

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