Toast is a simple and lightweight extension that allows you to save all tabs in open browser window. This way you can switch from project to project or between work and home tabs in a second, without having a mess of tabs and windows.

Polyglot for Safari is the missing Safari extension that translates selected text into your native language.

Dark Mode for Safari is an extension, similar to Google Chrome extensions, that provides a better way to enjoy surfing the web by using a dark theme.

Switch Browser is a "Share Menu" extension for macOS which shows browser switcher anywhere where there's a webpage opened and Share menu is available (File -> Share in Crome for example or a dedicated button in Safari)