As a web browser, Mozilla Firefox is renowned for its massive collection of “add-ons”, which are downloadable extensions that allow users to customize and enhance their web experience. To date, there are thousands of free and paid add-ons available. To help you sort the best from the rest, here are a few of the most popular and highly rated Firefox add-ons around.

1. AdBlockPlus

For many, surfing the internet can be a pretty obnoxious experience – especially with the onslaught of ads they are confronted with each time they hop online. AdBlockPlus blocks almost all those annoying pop-ups, banner ads, and self-playing videos with ease. No add-on offers a better ad-free experience than this one.

2. LastPass

The name for this add-on comes from the concept of creating “the last password you’ll ever need”. As add-on devotee Mark Paton says, “Lastpass keeps all account information, from e-mail to Youtube and Facebook, in one secure, convenient location”. With this Mozilla Firefox add-on, users can make their actual passwords more complex and secure, as only the master password is needed to access them.

3. Personas

Users looking to spice up and customize the look of Mozilla Firefox can do so very conveniently with Mozilla’s own Personas add-on. It offers a massive gallery of themes that can be applied to the browser, giving it the look and feel that you find most aesthetically pleasing. Switching between themes is a breeze, too, as there’s no installation for new ones necessary once Personas is added on.