Firefox and Chromium Security

Chromium is far more secure than Firefox. Firefox's sandboxing and exploit mitigations are much poorer than Chromium's. This article is not blindly hating on Firefox but is a factual analysis of its weaknesses.

Firefox's Sandbox

Sandboxing is a technique used to isolate certain programs to prevent a vulnerability in them from compromising the rest of the system. All common browsers nowadays include a sandbox. The browser splits itself up into different processes (e.g. the content process, GPU process, etc.) and sandboxes them individually. It is very important that a browser uses a sandbox. Otherwise, any exploit in the browser can be used to take over the rest of the system. With a sandbox, they would need to chain their exploit with an additional sandbox escape vulnerability.

However, sandboxes are not black and white. Just having a sandbox doesn't do much if it's full of holes. Firefox's sandbox is quite weak for the following reasons:

Firefox's Exploit Mitigations

Exploit mitigations are self-explanatory. They mitigate certain types of exploits. Firefox lacks many important mitigations while Chromium generally excels in this area.

Miscellaneous

Firefox does have some parts written in Rust, a memory-safe language, but the majority of the browser is still written in memory-unsafe languages so this isn't anything substantial and Chromium is working on switching to memory-safe languages too.

Firefox also uses RLBox but this is only used to sandbox a single library, Graphite and again, is not anything substantial.

Other Security Researcher Views on Firefox

Many security experts also share these views about Firefox.

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