I am looking for either a FireFox extension or a similar program that can handle GET and POST requests. The user will enter the form action and as many pairs of form keys / values as possible. It will also send any cookie information (or send current cookies from any domain that the user selects). A web developer add-on is almost what I'm looking for; This allows you to quickly see form keys, but it does not allow you to change them or add new ones (which leads to a lot of painful JavaScript in the address bar ...)
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