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DownThemAll! AntiContainer Requires Restart
Make the resources behind container pages easily downloadable by DownThemAll!
QuickDrag Requires Restart
Extends the function of the drag-and-drop mouse gesture so that it can be used to load URLs, do a web search of selected text on a page, or save an image on a page. The successor to Super DragAndGo.
Simple Steganography Requires Restart
Hide messages in PNG-32 images, extract them via context menu. The text is embedded invisibly by a "Least Significant Bit" algorithm.
You can also encode very short messages by re-sorting text lists and extract them via context menu.
Tooltip Plus Requires Restart
Show tooltips for links and images with URLs, icons, alt text, and long titles.
Blog Better! - Writing Helper by Zemanta Requires Restart
Increase your pageviews and improve your blog posts with related posts, images and links!
Find Image Copies Requires Restart
The Find Image Copies Firefox extension helps you quickly find image copies. Search for image copies straight from the right-click menu in any website.
Shop Companion
Access to full-resolution product images and videos on various shopping sites is easy with this add-on. It adds links to the largest/xxl/best-size version of product images on various shoppings sites.
Open-source code on github.com/ShopCompanion
To create your own collections, you must have a Mozilla Add-ons account.