FWIW, killing XUL extensions wasn't even really about Chromium compatibility. The changes in the Quantum rearchitecting were going to break everything anyway; t

FWIW, killing XUL extensions wasn't even really about Chromium compatibility. The changes in the Quantum rearchitecting were going to break everything anyway; the decision was made to move everything onto an add-on system which wouldn't just break again and again with every architectural change (which, yes, did have the benefit of Chromium compatibility).