The main rule to remember is that our trademarks may not be modified (see our trademark policy for details). The basic requirements explained below can serve as a handy reference as you work your way through the policy:
The following basic guidelines apply to almost any use of Mozilla’s trademarks in both online and offline materials:
Proper Form: Mozilla’s trademarks should be used in their exact form – neither abbreviated nor combined with any other word or words (ex. things like “FFox” or “Foxbinary” are off limits).
Accompanying Symbol: The first or most prominent mention of a Mozilla trademark should be accompanied by a symbol indicating that it’s a registered trademark (®). The logos available for download as part of this style guide already include the appropriate symbol.
Notice: The following notice should appear somewhere nearby (at least on the same page) the first use of a Mozilla trademark: “[TRADEMARK] is a registered trademark of the Mozilla Foundation.”
Distinguishable: In at least the first text reference, the trademark should be set apart from the surrounding text, either by capitalizing, underlining, bolding or italicizing it.
You can certainly use Mozilla logos to make t-shirts, desktop wallpaper, baseball caps or any other item you can think of, though only for yourself and your friends.
In other words, you can’t put one of our logos on anything that you produce commercially (whether or not you make a profit) without our advance permission.
Your use of Mozilla’s trademarks should be non-confusing.
In other words, people should always know who they are dealing with and where the software they are downloading came from. Websites and software that are not produced by the Mozilla Foundation shouldn’t imply (either directly or by omission) that they are.
Your use of Mozilla’s trademarks should be non disparaging.
That is, outside the bounds of fair use, you can’t use our marks as vehicles for defaming us or sullying our reputation.