QuietCSS от TomMakes

A Firefox extension that gives users control over their browsing experience by allowing them to suppress, restyle, or cover distracting visual elements on any webpage. Target audience: intermediate-to-advanced desktop users (keyboard + mouse) who understand how webpages and browsers work.

View a demo of the basic use

Note: This is still a work in progress. Features that you can expect in the future are:
- Import/Export of Styles + Account Data Sync

Any features listed in Future Features are not finalized to be added.