Firefox prompts for your permission to read from the clipboard: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Interact_with_the_clipboa

Firefox prompts for your permission to read from the clipboard: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Interact_with_the_clipboard https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web... But I'm not sure if that's always been the case.