STATUS: Currently not working, installs fine, but has no effect.
A Cleaner Internet is a firefox extension that means to clean up youtube and amazon pages to avoid all the clutter.
Installation
Installing it requires to use force install:
Notes
The extension has at least one feature, its messaging.js, that snoops the user-agent string for the substring Firefox, so using this extension may require setting the user-agent string to a Firefox ua string (or using the compatMode pref).