Copied value's mimetype when browser extension is used

Is there a mimetype set when passwords are copied to clipboard with the browser extension? I started to use a GNOME extension called Pano which ignores passwords copied with 1Password app. However it cannot do it when the browser extension is used.

There seems to be a discussion with browser extensions here. If there's a mimetype being used, I can gladly communicate this to its developer. If not, can this be added, please?

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1Password Version: Not Provided
Extension Version: 2.6.0
OS Version: Fedora Silverblue 37
Browser:_ Firefox