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Mozilla Firefox Addons 
Replaces random selected keywords either for a German or an English text with list of choices.
This is meant to improve your German or English grammatical knowledge.
The language of the Web page is detected automatically.
No misnomer here, this Firefox extension allows you to copy the URL of a detected RSS or Atom XML feed to the clipboard, making it uber-easy to subscribe in other applications (such as Thunderbird). You probably know that Firefox doesn't provide an easy way to access the URL.
CopyFeedLocation gives you three easy ways to access a feed URL... an optional toolbar button, a right-click menu option for the standard Feed Button (subscription icon), and a Firefox context menu item. Each is flexible to handle one or multiple detected feeds on a given website, so you can quickly get the feed you want and move on.
Right-click on any link and scan the target with VirusTotal, scan your downloads with VirusTotal before storing them in your PC, free and easy. More information at: https://www.virustotal.com/documentation/browser-addons/mozilla-firefox/
Protect Firefox with Extension Defender, scan your extensions for unwanted or malicious apps. Install Extension Defender and stay protected.
Keep track of and show your friends what music you listen to from YouTube, Pandora.com, Grooveshark.com, Meemix.com, and more, in real time, and even show it directly in Facebook.
For your existing Picasa Web Albums, semi-automatically fill in the captions with the file names of your photos. Despite being semi-automatic, it's 10-fold+ faster than doing it manually for most people.
This addon automatically copies everything you enter into your address bar to the search bar.
A nice button to let you share any page on (more than 30) top social networks, Google plus, eMail, or translate it in any language supported by Google, even get automatically html (href) links to use for references in your own blog or web site.
