Kill It (A Firefox Add-on)

The Problem

Modern browsers have largely conquered the problem of popup windows being created by obnoxious web sites. Nowadays the bad guys have moved on to what is called "slide-in" or "fly-in" advertising. There you are reading an article and some ad starts sliding in from the side to nag you to subscribe to something or other. For example I found that Tumblr blogs were sliding in little boxes to nag me to subscribe to the blog but the slide-in would often hide some useful button.

I have been using the venerable Remove It Permanently (RIP) add-on for many years but it is not up to the job of removing slide-ins. For example the Tumblr slide-in machinery hides within a script buried deep within the page. It is only triggered by an action such as scrolling so it doesn't appear until after RIP has finished looking at the page. This add-on is my replacement for RIP. It uses the latest Firefox add-on technology to be much more aggressive in rooting out this stuff.