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Extensions 
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Download Facebook videos
Download videos, thumbnails, gif images, photos from Facebook pages, groups, stories, profile, comment, cover.
Azimuth: Download Facebook 360° Photos
Automatically downloads, stitches, and adds META tags to Facebook 360 Photos
DYL Download Facebook Video
Download Facebook Video, Story, Block Ads (Sponsor), Block Seen Story, Block Seen Message, Block is Typing
Download video from facebook
Chrome plugin that extends the facebook context menu and adds functionality for downloading the selected video element