These are plugins and extensions for browsers, primarily Firefox and Chrome.

Firefox

  • Firebug – edit and check your web pages live
  • Http Headers – view server response codes behind the scenes
  • Search Status – check for nofollow links, Pagerank and much more (recommended)
  • Chris Pederick’s Web Developer – Test pages on the fly with different code configurations
  • Roboform – works across many browsers – huge time saver for filling forms

Chrome