What are some alternatives?
When comparing ScriptSafe and addons.mozilla.org PrivacySuite, you can also consider the following products
Ghostery - Privacy tool for transparency and control
uMatrix - uMatrix: A point-and-click matrix-based firewall, with many privacy-enhancing tools.
Disconnect - Make the web faster, more private, and more secure. Disconnect lets you visualize and block the invisible sites that track your search and browsing history.
uBlock Origin - Popular and efficient blocker for Chromium, Chrome, Edge, Firefox, Opera, Safari, Thunderbird.
TrackMeNot - TrackMeNot is an extension for the leading web browsers that allow the users to protect the web searchers from data profiling and surveillance by search engines.