About

From an official FAQ:
What is an add-on?
Add-ons are small pieces of software that add new features or functionality to your installation of Firefox. Add-ons can augment Firefox with new features, foreign language dictionaries, or change its visual appearance. Through add-ons, you can customize Firefox to meet your needs and tastes.

Firefox Add-ons Home

Note: Add-ons and extensions are synonyms, but they are different from plugins or search plugins. However, tag currently serves for all types of these tools.

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