There are probably no collisions in the new cache or they are very rare since the hash is large. There is a code in the new cache to handle the collisions but it was never tested. Bug 1151810 will increase the probability of collision so we need to test how the current code handles hash collisions and fix any possible bug.
Bulk change to priority: https://bugzilla.mozilla.org/show_bug.cgi?id=1399258
Priority: -- → P5
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