Content Scraping and Javascript automation

I want a list of websites (not owned by us ) to be automated using javascript. I can give you a template of a sample script - so you will know exactly what to do. The scripts written by you will be executed by our engine. This task also involves manual data\content scraping. I'll give you the list of websites. Steps: Visit a website - Identify the IDs of the input elements -> Scrape the data for dropdownlists, & Radio Buttons --> Develop a javascript script (based on the template supplied to you). For each website it should take about 2 to 3 hours depending upon your experience. Ideally I want someone who has browser (chrome or firefox) extension development experience. If you are committed to any other projects, let me know in advance. Also, I want to know how many hours can be dedicated for this task every day.