With long screenshot.
The buttons group always sit in the bottom of image, but some HTML element like navbar always sits on top of frame, so in result it’s always in the middle of screenshot.
So I need something like shortcut key to Save when I scroll to top of page to avoid navbar in my screenshot.
A keyboard shortcut has been on the radar for a while. You can see updates at https://github.com/mozilla-services/screenshots/issues/2491