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FireBug
FireBug lets you explore the far corners of the DOM by keyboard or mouse. All of the tools you need to poke, prod, and monitor your JavaScript, CSS, HTML and Ajax are brought together into one seamlesPlugins in Ruby on Rails
A Rails plugin is either an extension or a modification of the core framework. Plugins provide: * a way for developers to share bleeding-edge ideas without hurting the stable code base * a segmented aEdgeRails in Ruby on Rails
Edge Rails is a term that means you are running a local copy of the latest SVN trunk of Rails, instead of using gems. By checking out the trunk into your /vendor dir, Rails will automatically use that