What are some alternatives?
When comparing ScriptSafe and addons.mozilla.org 3P Request Blocker, you can also consider the following products
uMatrix - uMatrix: A point-and-click matrix-based firewall, with many privacy-enhancing tools.
Ghostery - Privacy tool for transparency and control
uBlock Origin - Popular and efficient blocker for Chromium, Chrome, Edge, Firefox, Opera, Safari, Thunderbird.
Beef Taco - Sets permanent opt-out cookies to stop behavioral advertising for 100+ different advertising...
Privacy Badger - Privacy Badger blocks spying ads and invisible trackers. How is Privacy Badger different from Disconnect, Adblock Plus, Ghostery, and other blocking extensions?