Firefox and Chrome still require Python 2 to build. They also had a decade to migrate but didn't. And these are the tech companies.
Depot tools should work and about 1.5 years you could build most of Chromium on Windows with Python 3.
[0] https://bugs.chromium.org/p/chromium/issues/list?q=Proj%3DPy... [1] https://bugs.chromium.org/p/chromium/issues/detail?id=942720...