In bug 1342060, wasm was also enabled for esr52 to match release 52. I think it would actually be better to keep it off in esr52. One reason is that there are a few spec fixes (e.g., one piece of bug 1338002) that didn't make 52 because it was fine for the fix to come in the next release, but waiting a whole esr cycle could bake in the spec differences. So, my request is to back out the two csets in bug 1342060 comment 22.
a+ from me for the backout in esr52.