FBTake's answer:
Hover Zoom - Enlarge thumbnails on mouse over.
FDOWN.net - Download Facebook videos and save them without using Java or installing software.
Image Max URL - Help find larger or original versions of images, including a customizable image popup feature
SnapSave - SnapSave allows you to download your favorite Facebook Videos in HD qualities, including 1080p, 2K, and 4k on any device.
Hover Zoom+ - Google Chrome extension for zooming images on mouse hover - extesy/hoverzoom
Download Facebook videos - Free tool to save videos and photos from Facebook.