NPAPI Plugin (Must read)

 

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

http://hudolejev.blogspot.com/2009/08/building-npruntime-sample-plugin-in.html

http://colonelpanic.net/2009/03/building-a-firefox-plugin-part-one/

http://colonelpanic.net/2009/12/memory-management-in-npapi/

http://git.webvm.net/?p=npsimple

 

Browser Plugins vs Extensions

http://colonelpanic.net/2010/08/browser-plugins-vs-extensions-the-difference/

 

Four part tutorial (MUST read for everyone trying to understand the NPAPI)

http://colonelpanic.net/2009/03/building-a-firefox-plugin-part-one/

http://colonelpanic.net/2009/05/building-a-firefox-plugin-part-two/

http://colonelpanic.net/2009/08/building-a-firefox-plugin-part-three/

http://colonelpanic.net/2011/07/building-a-firefox-plugin-part-four/

 

In linux,

http://inferno-firefox.blogspot.com/