If you mean is there something that compares Firefox battery drain to Chrome battery drain, then I don't care because Chrome is also garbage about energy efficiency. If you mean is there something that compares Chrome battery drain to Safari battery drain, no I don't think so.
Microsoft has been working real hard to bring the original Edge's battery efficiency to Chrome.
Isn't Edge using Chromium in the first place?
Right, they’re working to bring the old non-Chromium Edge’s efficiency to Chromium for the new Edge.