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The same feature is now available in Edge Canary Build 86.0.569.0.
The new #intensive-wake-up-throttling setting has the following description:
In Google’s testing when the company loaded 36 random background tabs and had a blank foreground tab battery life increased by 28%, and when Google had a 36 random background tabs and a foreground tab playing a YouTube video (a more realistic scenario) battery life still increased 13% (36 minutes) over no throttling.
The #intensive-wake-up-throttling flag is off by default and can be toggled under edge:/flags.