Greasemonkey (Chrome/Firefox/Opera/Safari/Android): The Windows download world is in a sad state. Lots of download sites, including popular ones like Sourceforge and Adobe, bundle extra crapware with their installers. AntiAdware is a simple script that blocks these, so you don't have to worry about getting tricked.
AntiAdware is a Greasemonkey script, so you'll need Greasemonkey for Firefox or Tampermonkey for Chrome to install it (you can install it manually in Chrome as well, but it won't receive updates). AntiAdware blocks adware on nearly 40 sites, including Sourceforge, Softonic, Adobe.com, CNET and a number of file hosting services like Filefactory.
Note that AntiAdware won't block crapware that's normally built into a given app's installer, but it will block crapware that download sites add. For example, it will remove the McAfee checkbox on Adobe.com, or make the main download button on Sourceforge link to the plain installer (rather than the SourceForge installer). In most cases, you can easily avoid these problems on your own, but if you're particularly click-happy, you might miss them. It's also great for installing on a tech-unsavvy friend or relative's computer.
Hit the link below to read more and download the script.