WebTest Api comes as an extension for personal use. At present after requests from colleagues and friends I give free public tool.
• Edit header
• Creating cookies
• entering proxy credentials
• web Calls get, post etc.
• decoding the response html, xml and json (texbox to do copy and paste the result)
• Created simple website where test functions
• Test web service
I hope this simple extension can help you on a daily basis, how does it help me for a few years.