Shined up real nice.
Remove forced download accelerators, managers, and adware on supported websites
You may also like Popup Blocker Script.
Avoid to get unwanted applications while downloading on many websites with AntiAdware! (also known as Adware Atomizer)
Click on a screenshot to view it larger
See here for the full list of the ~40 supported websites.
or (not recommended)
After that you correctly prepared the installation, you can download the script here:
Check it out here! https://github.com/HandyUserscripts/AntiAdware/releases