AutoFill plugin/extension which works for all browsers?

AutoFill plugin/extension which works for all browsers?

Hi all.  

I am currently thinking of writing an AutoFill plugin/widget which will take my personal data such as First Name, Last Name etc from a file/javascript and will automatically fill it in web page form. I have read till now to build a plugin which works for all browsers, I have two options:- 1) To make a Jquery UI widget 2) To make a NPAPI plugin


Is there any other easier method to develop an autofilling plugin, and which option to take i.e. NPAPI plugin or Jquery widget ? Thanks