Public Beta Availiable - Win/Firmware

[parisse]

Firefox has mathml support, while Chrome does not (Edge probably too), this is provided by mathjax and will therefore fail sometimes (for example if you are really offline). In addition, Chrome is about 5* slower than Firefox if Xcas is using JS+asmjs (and not wasm), I did not check recently (Chrome is no more compatible with my old Mac OS X.10).
And Firefox is free software, while Chrome, Edge, Safari are not, I believe it's still a good idea to recommend using free softwares. If there are not enough free browser users who knows how the web could evolve...