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* Setting up environment.

In 'about:config' set this variable:

  javascript.options.showInConsole = true

                Logs errors in chrome files to the Error Console.

  javascript.options.strict = true

                Enables strict JavaScript warnings in the Error Console.

  extensions.logging.enabled = true

                This will send more detailed information about installation and update

                problems to the Error Console.

  https://developer.mozilla.org/en/Setting_up_extension_development_environment

                setting up profile, options and about developer plugin

* Useful developer plugin.

** Firebug.

Firebug integrates with Firefox to put a wealth of development tools at your fingertips

while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any

web page.

  http://getfirebug.com

                home page

  https://addons.mozilla.org/firefox/addon/1843

                download page

* Extension security.

  https://developer.mozilla.org/en/Security_best_practices_in_extensions