Speedometer executes a bunch of TodoMVC projects, so it's a mix of JS and DOM work. FF has done a lot of cool work on their DOM and have started to focus some on making JS faster, so they are pretty fast here.
If you are interested in just JS, JetStream 2 is a good metric IMO, but is perhaps less "real world" as it doesn't really do DOM stuff. FF is slower here, but has made a lot of progress recently. (going from somewhere around 35% slower to around 10% slower).
https://browserbench.org/Speedometer2.0/
If you are interested in just JS, JetStream 2 is a good metric IMO, but is perhaps less "real world" as it doesn't really do DOM stuff. FF is slower here, but has made a lot of progress recently. (going from somewhere around 35% slower to around 10% slower).
https://browserbench.org/JetStream2.0/in-depth.html