Creating Firefox extension

Best editor notepad++

introduction
https://developer.mozilla.org/en/Building_an_Extension

http://www.slideshare.net/robnyman/how-to-write-your-first-firefox-extensio

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

"%ProgramFiles%\Mozilla Firefox\firefox.exe" -no-remote -P dev

profile folder:
http://kb.mozillazine.org/Profile_folder

%APPDATA%\Mozilla\Firefox\Profiles\[profile_id]\extensions