Full Page Screenshotter от Amarjit

Full Page Screenshotter captures complete web pages in Firefox, including content below the visible screen.

Use Fast Capture for normal pages, or Dynamic Scroll Capture for long, lazy-loaded, app-style pages with vertical, horizontal, or nested scrolling.

The extension only captures a page when you click the toolbar button.

Code is fully opensource - https://github.com/Amarjit/full-page-screenshotter

Features:
✓ Fast Capture for normal pages
✓ Dynamic Scroll Capture for tricky long pages
✓ Handles vertical, horizontal, and nested scroll areas
✓ Hides repeated sticky headers, nav bars, and common chat widgets
✓ Advanced options for delay, overlap, max scrolls, backgrounds, and animations
✓ Opens result in a new tab with Download and Copy buttons
✓ Private by design: captures only when you click, with no tracking, no analytics, no uploads, and no external services