This assert means the content process has note been good at doing the bookkeeping of blob image keys. Unfortunately the stack of the assertion doesn't help. I'm thinking of adding some nightly-only checks in the content process, keeping a hash map of live keys to move the assertion closer to the source of the issue. This will probably have a negative performance impact, though.
Bug 1604137 Comment 1 Edit History
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This assert means the content process has not been good at doing the bookkeeping of blob image keys. Unfortunately the stack of the assertion doesn't help. I'm thinking of adding some nightly-only checks in the content process, keeping a hash map of live keys to move the assertion closer to the source of the issue. This will probably have a negative performance impact, though.