Now that bug 1400637, seems to be reduced to a more manageable level, we're going to try this on Beta again. We may have to back out the Alternate Desktop part if we get too many issues with AV that we can't resolve.
Pushed by email@example.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/da41769f7553 Part 1: Block prntm64.dll and guard32.dll in sandboxed child processes. r=jimm https://hg.mozilla.org/integration/mozilla-inbound/rev/c376bb034ca6 Part 2: Make level 4 the default for the Windows content process sandbox. r=jimm
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