I have been using your extension for some months now, and I LOVE IT! It is simple and effective. However, I am currently facing a new use case that this extension is not covering now, but I think that could be added easily and it would add a lot of value. I mean to add a feature to send URLs with POST instead of GET. GET is ok in most cases, but sometimes the data you need to pass to invoke certain URLs is not visible in URL arguments (GET method) but embedded inside forms (POST method).
There is an extension called Get2Post & PostForm which wisely allows you to write the variables as regular URL parameters (i.e. using the http GET method), converts them into POST variables and invokes a POST method. This is nice, but pretty limited, as that extension only allows one URL each time it is invoked. Adding a POST option to your extension would be great. I am pretty sure that other users could benefit from this new feature as well, as it is quite common that responses to forms are not visible in the URLs, but embedded in the POST body.
Let me explain my issue. This way you will realize how your extension could cover it. Regularly, I need to check blocks of 10 to 30 IP addresses in www.ipvoid.com/ip-blacklist-check/, but the IP is not a visible argument, but it is passed in the variable IP of the POST form. It forces me to fill the form each individual time. Imagine how great it would be to write all the www.ipvoid.com/ip-blacklist-check/?ip=xxx.xxx.xxx.xxx in a list and specifying that I need the data to be sent by POST. I am pretty sure that other users, like me, currently don't have any easy way to make bulk calls like this when forms are involved, so I think they would really appreciate this extra feature as well.