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Add-on Policies

Add-ons extend the core capabilities of Firefox, enabling users to modify and personalize their web experience. A healthy ecosystem, built on trust, is vital for developers to be successful and users to feel safe making Firefox their own. For these reasons, Mozilla requires all add-ons to comply with the following policies. These policies are not intended to serve as legal advice: depending on where you are located, additional requirements may apply.

All add-ons are subject to these policies, regardless of how they are distributed.

When an add-on is given human review or otherwise assessed by Mozilla, these policies act as guiding principles for those reviews. Add-ons that do not comply with these policies may be rejected or disabled by Mozilla.

1. No Surprises

Users should be able to easily discern the functionality of your add-on based on the listing, and should not be presented with unexpected user experiences after installing it. The listing should include an easy-to-read description of what the add-on does, and what information it transmits. Please consult our best practices guide for creating an appealing listing.

1.1. Unexpected features

“Unexpected” features are those that are unrelated to the add-on’s primary function, and are not clearly indicated by the add-on name or description. This may include features that impact user privacy or security, make unexpected changes to web content, or change default settings like the new tab page, homepage, or search engine.

Any “unexpected” feature(s) must adhere to all of the following requirements:

  1. The add-on description must clearly state any changes made by these features.
  2. The features must be “opt-in”, meaning the user has to take non-default action to enact the change. Changes prompted by Firefox after the add-on is installed do not require an additional opt-in. The permissions prompt shown when installing an add-on does not alleviate the need for an opt-in.
  3. The opt-in interface must clearly state the name of the add-on requesting the change.

2. Content

Add-ons that make use of Mozilla trademarks must comply with the Mozilla Trademark Guidelines. If the add-on uses “Firefox” in its name, the naming standard the add-on is expected to follow is “<Add-on name> for Firefox”.

In addition, add-ons listed on addons.mozilla.org must adhere to the following policies:

  1. All add-ons submitted for listing on addons.mozilla.org are subject to Mozilla’s Acceptable Use Policy.
  2. Listings must disclose when payment is required to enable any add-on functionality.
  3. Add-ons and their content must conform to the laws of the United States. (Add-ons that violate or have content that violates the law in other jurisdictions may also be removed or have access limited.)
  4. If the add-on is a fork of another add-on, the name must clearly distinguish it from the original and provide a significant difference in functionality and/or code.
  5. Add-ons with the sole purpose of promoting, installing, loading or launching an outside website, application or add-on are not permitted.
  6. Themes that feature low-quality, stretched, or blank images, as well as those themes in which the header image is misaligned, are not permitted. Duplicate themes are not permitted.