reinstate the update.xml hash check

Closed Issue created 8 years ago by Mark Smith

While working on legacy/trac#18912 (moved), Kathy and I discovered the following Mozilla change that causes the update.xml hash check to be skipped when signed MAR files are in use (this change shipped in Firefox 43): https://bugzilla.mozilla.org/show_bug.cgi?id=862173

I think the our philosophy is different than Mozilla's and that we probably want to reinstate the hash check. Mike and Georg, do you agree?

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