Safari is the only browser that supports Jpeg XL. Firefox does support it if you enable a flag but IIRC from bugzilla their implementation is currently not great.
If a browser feature needs to be enabled with a flag it’s not really supported since an extremely tiny portion of users will be able to use it, and it’s often buggy.
Then they aren’t headphones, they are earmuffs with noise cancellation. The insulation in the earmuffs is doing the real work. Noise cancellation by itself isn’t going to protect your ears much at all, if anything.