The 'Stealth Mode' software enhances privacy by darkening website content (95%) when the cursor is moved away from the browsing space on desktop. Takes only 10 seconds to activate.
One of the best things about Safe is that it's completely standalone. All the images and about 400 .css rules are embedded locally, so you can customize your browsing experience without any waste of internet bandwidth. There's no need to silently connect to any data hosting or repository, which means you can work offline and keep your customizations. The setup is only required to point to the profile in use, but to clear it from the system, all you need to do is delete the 'Styled+ for Firefox' folder in the profile (and the shortcuts in Desktop and SendTo).
The plus sign in the app name signifies that this app is all about adding more. Unlike other customization tools, Safe doesn't just offer Styles but also new features to help you browse more efficiently. If you're sticking to an old version of Firefox because of the User Interface customization, then you should definitely try out 'Styled+ for Firefox'. With this app, you'll be ready to upgrade to the Firefox Quantum latest version and revamp the lost and the last special features!
Version 2.0: added the 'Normal Themes+' panel and 2 bonus from the extra features 'Commands+Sounds' and 'Icons+Gadgets'