Mac: If you care about privacy, then you might prefer to use more than one browser. Perhaps you have use something like Firefox for all your social media, Chrome for anything that requires Flash, and Safari for general browsing. Browser Fairy is an app that allows you to set rules so links are always opened in your browser of choice. Browser Fairy allows you to set up a variety of different types of rules. For example, you can set it so links from a particular app are opened in a particular browser. So, any link you click on in Mail can be opened in one browser, while any link you click on in Tweetbot can be opened in another. You can also set it up so certain URLs are opened in a browser. Say, all Youtube links are opened in Chrome. You can also pick a browser on the fly with a handful of browser extensions and a keyboard shortcut. Whether it's for security, privacy, or just because you like one browser more than another occasionally, Browser Fairy makes swapping between them easy.
Browser Fairy ($7.99) [Mac App Store]