Input (grade 13): Mozilla Add-ons is the official Mozilla Foundation website to act as a repository for add-ons for Mozilla software, including Mozilla Firefox, Mozilla Thunderbird, SeaMonkey, and Mozilla Sunbird.
Output (grade 10): Mozilla Add-ons is the official Mozilla website to store add-ons for Mozilla software. This software includes Mozilla Firefox, Mozilla Thunderbird, SeaMonkey, and Mozilla Sunbird.