20ad00a0fe
Replaces the global gFactoryOps array with a linked list to improve performance during factory operation handling. This change improves performance in scenarios where many database open/close operations are initiated in parallel. The array previously used for tracking active FactoryOp instances incurred linear-time removal overhead, which the linked list avoids. Unlike a hash set, the linked list preserves insertion order, which is required for correctness. This is part of the ongoing effort to reduce jank caused by frequent IndexedDB open/close activity, tracked in the associated meta bug. Differential Revision: https://phabricator.services.mozilla.com/D248708
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