From original article:
"Aviary’s powerful image editor is widely used in photo editing apps for smartphones. Though it’s far less common to see it integrated in on the web, since most web services do not provide a lot of editing options, or offer their own tools instead.
Fly Photo Editor for Facebook is a Chrome extension that integrates Aviary’s photo editing tools in Facebook. The extension lets you enter an edit mode from the theater view of any photo, and you can then proceed to add filters and frames to the image, crop it, add stickers to it, draw on it with a free hand drawing tool, and more. Once you’ve made the desired changes, the extension uploads your edited image to the same album as the original one."