Firefox version 21 What is the WEB DEVELOPER TOOL ? What are the fuctions and what is it for?

I just want to know what all the tools do in the tools bar/ web developer
What does each of them control?

Current Firefox versions have a lot of built-in web developer tools including an Inspector and Style editor.
*https://developer.mozilla.org/en/Tools
The Web Developer toolbar has a help menu (F1) to facilitate entering commands.<br />
You can also use this toolbar to make a full page screenshot.
*https://developer.mozilla.org/en/Tools/GCLI
*https://developer.mozilla.org/en/Tools/Debugger
*https://developer.mozilla.org/en/Tools/Scratchpad
*https://developer.mozilla.org/en/Tools/Page_Inspector
*https://developer.mozilla.org/en/Tools/Page_Inspector/HTML_panel
*https://developer.mozilla.org/en/Tools/Page_Inspector/Style_panel
*https://developer.mozilla.org/en/Tools/Page_Inspector/3D_view
*https://developer.mozilla.org/en/Tools/Style_Editor

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