[rnhmjoj]

> Can it let me pick any visible HTML element on a website to filter out just by clicking on it?

The best it can offer is a CGI editor to change its configuration from the browser. I don't see how you could implement something like this: it's either interactive or a passive network element, but not both.

> Can it block content of a website without interfering with a `curl` request or a file download from a random messenger app?

This is really trivial, just don't proxy them (ie don't set the http_proxy variable).