Hi Not as far as I am aware, no.

The screenshot is within your system.

There might be ways to detect either the built-in or an add-on screenshot tool being used. However, not being devious spy-weasels ourselves, we don't know what those methods would be. Maybe if you search around on the web something will pop up? By the way, some sites detect and block the right-click context menu. To work around that, hold down the Shift key while right-clicking. If you don't even want the site to know you right-clicked, there's an optional screenshot button (<img src="https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/gallery/images/2021-03-24-13-35-55-2c2e06.png">) you can add to the main toolbar using Customize. More info on that: [[Customize Firefox controls, buttons and toolbars]]