DevBoi is a Firefox add-on that adds a sidebar with web-development references and documentations for HTML, JavaScript, CSS, PHP, Ruby on Rails & Prototype.

Firefox Web-Dev Sidebar

The sidebar is very handy for any developer as you can reach it with a simple "CTRL+F9", find any function or property, see the browsers it supports & more.

Standard installation supports:

  • HTML 4.01/XHTML 1.0,
  • CSS 2.1,
  • DOM 2,
  • JavaScript 1.3

Support for other languages can be downloaded from here.

You can also go the original website for the add-on for downloading it without registering.

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