I'm strongly against the removal of XSLT support from browsers—I use both the JavaScript "XSLTProcessor" functions [0] and "<?xml-stylesheet …?>" [1] on my personal website, I commented on the original GitHub thread [2], and I use XSLT for non-web purposes [3].
But I think that this website is being hyperbolic: I believe that Google's stated security/maintenance justifications are genuine (but wildly misguided), and I certainly don't believe that Google is paying Mozilla/Apple to drop XSLT support. I'm all in favour of trying to preserve XSLT support, but a page like this is more likely to annoy the decision-makers than to convince them to not remove XSLT support.
But I think that this website is being hyperbolic: I believe that Google's stated security/maintenance justifications are genuine (but wildly misguided), and I certainly don't believe that Google is paying Mozilla/Apple to drop XSLT support. I'm all in favour of trying to preserve XSLT support, but a page like this is more likely to annoy the decision-makers than to convince them to not remove XSLT support.
[0]: https://www.maxchernoff.ca/tools/Stardew-Valley-Item-Finder/
[1]: https://www.maxchernoff.ca/atom.xml
[2]: https://github.com/whatwg/html/pull/11563#issuecomment-31909...
[3]: https://github.com/gucci-on-fleek/lua-widow-control/blob/852...