I'm switching from Firefox to Safari as my default browser. However I have a couple years worth of cookies saved in Firefox which I want to bring into Cookie v.5.2.1. These cookies are sites which I trust: https://www.dropbox.com/s/kzgyr9v89milzv9/Screenshot 2017-01-13 10.28.25.jpg?dl=0

How do I export my Firefox cookies and bring them into Cookie v5.2.1?

Should I use a third-party Firefox extension like https://addons.mozilla.org/en-us/firefox/addon/cookies-exportimport/reviews/?