Keep open a Firefox windows extension

Hi, An extension for Firefox that was developed for me allows clicking on a toggle to add a URL parameter and reload the page. It is imperative that the extension window remains open, even if the page is reloaded. This extension window should only be closed on click out. Could you tell me how to keep it open? Thanks for your help

Popups can not be kept open. If you want a separate UI that stays around, maybe consider using a sidebar or an actual window (using

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