In Firefox lingo, add-ons can consist of a number of things: extensions, themes, plugins, services, search providers, language packs, etc.
Add-ons allow you to change how Firefox works, extend its functionality or customize the appearance of the browser.
This will open another tab where you can find and manage add-ons, extensions, themes, plugins, etc.
If you already know what you are looking for, you can simply search for the add-on in the box at the top.
Collections is a really cool section that is created by users who group together several Firefox add-ons that relate to a specific idea or concept.
For example, you can install the Reference Desk collection, which will install Scrap Book, Merriam-Webster and Memonic Web Clipper together.
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