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Hardening the Firefox Front End with Content Security Policies
Most of the Firefox User Interface (UI), including the address bar and the tab strip, are implemented using standard web technologies like HTML, CSS and JavaScript plus some additional custom components like XUL. One of the advantages of using web technologies for the front end is that it allows rendering the frontend using the browser engine on all desktop operating systems. However, just like many web applications are susceptible to some form of injection attack (OWASP Top Ten), Firefox’s use of web technologies for the frontend makes it no exception and hence it is vulnerable to injection attacks as well.
Most of the Firefox User Interface (UI), including the address bar and the tab strip, are implemented using standard web technologies like HTML, CSS and JavaScript plus some additional custom components like XUL. In Pwn2Own (a computer hacking contest) 2022 a participant managed to find a chain of exploits that allowed them to escape the web content sandbox (cf. Due to the fact that browser.xhtml provides the largest attack vector of our frontend code we focused our initial efforts on securing and hardening browser.xhtml which already drastically improves the status quo to prevent inline script execution.
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