Raw error output:
Problem while applying patch in revision 216988:
hg error in cmd: hg import --no-commit -s 95 /tmp/tmpi97h0yzf: applying /tmp/tmpi97h0yzf
patching file toolkit/modules/LightweightThemeConsumer.sys.mjs
Hunk #4 FAILED at 691
1 out of 4 hunks FAILED -- saving rejects to file toolkit/modules/LightweightThemeConsumer.sys.mjs.rej
abort: patch failed to apply