Codex’s Chrome plugin has been voted by me as the most useful invention of this quarter.

Any repetitive or complex debugging work can be handled by Codex taking over your browser and automatically debugging it—saving you ten times the time.
I’ve already used it to automatically resolve many performance issues and handle a large amount of real, repetitive testing work.
It’s best to pair it with an experienced engineer to do this; otherwise, the efficiency improvement won’t be that significant—if all you keep doing is saying “it’s stuck,” then it’s meaningless.