How much money can you make with this work?
Consider this a part time job where you can only earn extra income. The amount of money paid per hour is average. However, it is hard to find enough usability testing jobs to make a living off it. You will be lucky to get one job in 3-4 days.
What kind of work will you do as a Website-Tester?
In some jobs, several users test a website, all at the same time. It is like a big live online conference. The client will chat with all testers to gather their feedback.
What are the requirements for doing this job?
You need a fast PC and internet connection. If English is not your mother tongue then you may need to have some Basic English speaking and writing skills [you might be required to write small report and in some cases, talk with clients].
Below are 11 sites/companies where you can get Website-Usability-Testing jobs: