Revisionists, rejoice! The Aviary add-on lets you edit images right in your browser without being rerouted to another site or program.
When you're browsing, just right-click an image and choose Edit Image in Aviary from the context menu. Up pops the image in a simple widget that lets you adjust colors, crop, rotate, eliminate red-eye, add silly "stickers" and more, then save it to your desktop.
There's also a screen capture feature that takes a snapshot of the page, opening it in a slightly more advanced in-browser image editor in a new window or tab. Here you can annotate your captures and add other effects, making this one powerful tool for bloggers or anyone else with an image-editing itch.