I don't remember the timeline, but Mozilla has worked on this in the past with ActiveState. https://developer.mozilla.org/en-US/docs/Archive/Mozilla/PyDOM https

I don't remember the timeline, but Mozilla has worked on this in the past with ActiveState. https://developer.mozilla.org/en-US/docs/Archive/Mozilla/PyDOM https://developer.mozilla.org/en-US/docs/Archive/Mozilla/PyD... I think this predates Firefox, and was abandoned more than 10 years ago.