Prepaid Credit Card Online

I want to get a prepaid MasterCard credit card for online purchases to places like Newegg, Amazon, etc.

Is this a work of prepaid cards as a credit card where sites that accept credit cards also accept prepaid cards?

Yes, in some respects, it is better.
You have already paid the money in advance and now you can use it to the limit of your payment less the fees for managing your ACCT. With a prepaid credit card you can not exceed the limit. so you do not have realistic debt to society because it is paid.

For the seller makes no difference. They submit your request to your creditor, which grants permission for a specified amount. If a transaction is authorized is all they care about.