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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.
Mozilla Support rules and guidelines
Rules and guidelines for using the Mozilla Support site.
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Learn how to connect with the Mozilla community to ask questions and find solutions from fellow users.
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.
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