Flock is a web browser developer by Flock Inc. Is similar with Firefox and offer the option to add extensions and set the multimedia options when are surfing Internet.Can drag and drop videos or images,text or URL links.Have file sharing features and want to be more than a simple browser.Flock is a good interface for YouTube or Facebook sites.Popular extensions for Flock are :TimeStamp Converter,searchOnTab,Dummy Lipsum,Custom Buttons etc.Is using tabs ;can manage feeds or your blog.

       
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A browser similar with Firefox and with sharing improvements. Have similar options with other known web browsers like: save frame,send link,open new URL,find,character encoding etc. Can adjust Favorites options for feeds,blogs or multimedia streams.Can clear cookies with a shortcut in Flock Tools.

Flock Privacy and Security options are related to passwords (can remember passwords for all sites or use a master password),popup block and to prevent automatic actions when surf the internet pages (downloads,addons installs etc).Can clean cache,history,accounts and authenticated sessions .
You can see Flock update history (tools->options->advanced->update) and choose if the new pages will be opened in a new tab or in a new window.Also , tou can enable or disable the images loading,JavaScript or pop-ups.

Flock Favorites Manager allow to import,export,make new folders or delete bookmarks.You can print a web page directly from Flock window (use Ctrl+P and set the printer options).