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File a bug report or feature request for Mozilla products

File a bug report or feature request for Mozilla products

Learn where to report a bug or file a feature request for Firefox, Thunderbird and other Mozilla products.

How does support localization work?

How does support localization work?

Learn how localization (l10n) - making content understandable for native speakers of a given language - works in SUMO and what type of content is localized.

Contributors guide on Firefox advanced customization with CSS

Contributors guide on Firefox advanced customization with CSS

What you need to know about Firefox customization with the userChrome.css file and how to help users get more help or revert their changes.

How to contribute to article localization

How to contribute to article localization

Learn how to translate SUMO articles in to your native language.

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