My product helps users keep track of the web sites they've visited,
but I want to be careful of web sites that were queried with POST
parameters. How can I write a Firefox add-on in C++ that intercepts
URL requests at a point when I can tell if they have POST parameters?
I have working code that tells me when a new tab has been opened, but
it seems none of the web site objects I have access to know whether
the original URL had POST parameters ...