Types
Sentence case: Capitalize the first word of the text element, as well as any proper nouns.
Title case: Capitalize every word in the text, except:
- Articles, except as the first word (a, an, the)
- Coordinating conjunctions (and, or)
- Prepositions, except the first or last word
- Infinitives (to, in, an)
To check if you're using title case correctly, put your text into Capitalize My Title using the AP setting.
Guidelines
For desktop browsers, Android browsers, and websites:
Default to sentence case to support scanning and strike a friendlier, more human tone. We sentence case the following:
- Headlines
- Buttons
Unless otherwise stated in the word list, please capitalize the following: brands and products (Mozilla, Firefox, Test Pilot, etc.); features (Firefox Screenshots, etc.); acronyms (URL, etc.). URLs (mozilla.org, firefox.com, etc.) are lowercase. The "a" in Firefox account is lowercase.
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Exceptions to sentence casing |
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Global Operating System menu bar |
Title case to align with Operating System conventions |
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Context menus |
Title case to align with Operating System conventions |
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Android snackbars |
All caps (UNDO, DELETE) |
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Tab audio state |
All caps (PLAYING, MUTE TAB, MUTED) |
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Proprietary product and feature names |
- Names are proper nouns, and so should use title case. - We don’t capitalize features like “new tab,” “shortcuts,” or “passwords,” because they’re not proprietary. Capitalize these words only if they are stand-alone section headers. |
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In-content pages |
Currently a mix of title and sentence case — this needs to be redesigned. |
For the Firefox iOS browser:
Follow Apple Human Interface Guidelines, which uses headline-style capitalization. Capitalize every word except articles, coordinating conjunctions, and prepositions of four or fewer letters.
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Specifics |
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Title case. |
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Title case. |
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Title case. Apple does not provide specific guidance, but title case seems to be their dominant pattern. |
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Title case. |
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- If the title is a complete sentence, use sentence case and appropriate end punctuation. - If the title is a fragment, use title case and no end punctuation. - As with all button titles, use title case and no end punctuation. |
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Information card headlines |
Title case. |
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Toasts |
Title case. |