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Battery drain in macOS big sur

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After upgrading to macOS Big Sur, Firefox (latest version) are consuming battery in the background when computer is sleeping and the battery drained out in a couple of days.

I checked the energy graph in macOS and indicates the Firefox are using the significant battery. I restarted my computer several times and reinstalled the latest version of Firefox and the problem still exist.

After upgrading to macOS Big Sur, Firefox (latest version) are consuming battery in the background when computer is sleeping and the battery drained out in a couple of days. I checked the energy graph in macOS and indicates the Firefox are using the significant battery. I restarted my computer several times and reinstalled the latest version of Firefox and the problem still exist.
Attached screenshots