I’m not sure what you mean by “prepare feature: file regedit ff 2021.” I’ll assume you want a step-by-step guide to add or modify a Windows Registry entry (regedit) for Firefox (FF) 2021—for example, to set a policy or default file association.
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If you have any questions or if there's a better way to achieve this for the ".ff" file type from 2021, please share your thoughts. I’m not sure what you mean by “prepare