How to call REST API using current instance of internet explorer extension

[Girish Dubey 1]

How to call REST API using current instance of internet explorer. I am working on extension for fill the form dynamicly and data comes from REST API. but for authontation we have to login on that application e.g.

 

REST API URL: http://dataservice.com/getusers.json

Login page: http://dataservice.com/login.aspx

 

and i wanted to fill data on another application

 

Form page url: http://localservice.com/users.aspx

 

and i have already logged in on http://dataservice.com domain and wanted to get data using internet explorer extension and fill form on second application which is available on different domain. 

so can you suggest me how it can be possible through Internet Explorer extension.