There are quite a few interesting Firefox extensions popping up for Lemmy and Kbin to make the experience even better:

• Lemmy Modern UI Theme - Adds a modern look for Lemmy
• Lemmy Link - Lets you open up other instances in your own instance easier
• Lemmy Go - Adds a new search keyword (lg) for more easily navigating to Lemmy communities.
• Instance Assistant - Simplify your Lemmy & Kbin experience with tools for your instance and communities
• Kbin Link - Find it annoying to copy paste instance links to look at a Lemmy community? This extension is for you.
• Lemmy Home Instance Helper - Adds a 'Search' link to Lemmy communities on servers where you are not logged in.

If you know of any more, please comment. :)