FWIW, this is the assert would fail if there is the cache file gets corrupted. If there aren't any clear correlations (to a particular URL or configuration), the "fix" might be to downgrade the MOZ_DIAGNOSTIC_ASSERT() into a plain MOZ_ASSERT() (which was already the motivation of having a MOZ_DIAGNOSTIC_ASSERT() instead of MOZ_RELEASE_ASSERT()); the `if (!ok)` branch right after the assert ensures graceful failure.
Bug 1737837 Comment 3 Edit History
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FWIW, this is the assert that would fail if the cache file gets corrupted. If there aren't any clear correlations (to a particular URL or configuration), the "fix" might be to downgrade the MOZ_DIAGNOSTIC_ASSERT() into a plain MOZ_ASSERT() (which was already the motivation of having a MOZ_DIAGNOSTIC_ASSERT() instead of MOZ_RELEASE_ASSERT()); the `if (!ok)` branch right after the assert ensures graceful failure.