I always use these Image related Add-On's. They cover just about everything you'd need to do to edit, enhance or annotate an image without leaving Firefox.
FireShot Webpage Screenshots captures webpage screenshot entirely (see demo: http://bit.ly/RlBQMV)
The screenshot can be quickly annotated and:
+ Saved as PDF/PNG/GIF/JPEG/BMP
+ Sent to clipboard
TinEye is a reverse image search engine. The plugin adds a context menu item that allows you to search for an image to find out where it came from, how it is being used, if modified versions of the image exist, or to find higher resolution versions.
Browse faster—Preview links and images without leaving your current page or tab. Just mouseover any link and a preview window appears to display the content.
Easily save images in personally customized...
Drag, drop and arrange pictures adding photo titles, and create albums by multi-selecting photos, and then upload to one of a selection of online photo services - all of this without interrupting your Internet browsing.
Save pictures from the web or your computer as your phone wallpapers.
Edit any image on the Web - Turn Firefox into an image editor using Picture2Life, you can choose from hundreds of cool effects, create collages or animations!
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