Please, make so that this addon make a simple request (GET) to some user defined URL to trigger any user`s procedure (when a webpage is updated).

Works as advertised. Sometimes sites with very active side-bars can fool it, so the only feature I'd add is to be able to "train" it what sections of a web page it should care about.

looks pretty good

So far, working. But please, remove the "Can't see your scan list? Upgrade to Update Scanner 4". Ok, I understood there's a paying upgraded version of this addon, now you can remove it, it's annoying, and its clutters the view in the side panel.

Edit: yes, I have very few item in the list, but it's still distracting.

The update scanning works quickly and efficiently.