Developer Terms of Service: Mozilla Location Service Query API

Introduction & Definitions

Mozilla Location Service (MLS) is a free and open service developed by Mozilla for the public benefit. This MLS Developer Terms of Service ("Terms") govern your use of the MLS Query API. Key definitions used in these Terms are defined below.

Commercial Project
Projects using the MLS Query API to further the primary purpose of private monetary gain.
End Users
Individuals receiving location through the MLS Query API
Public Interest Project
Projects using the MLS Query API to further the public interest such as research, open source software, standards development, education, recreation, social, or non-commercial technology.

Eligibility & Registration

Unless otherwise stated in these Terms, the MLS Query API is available as follows:

  1. Commercial Project licenses are capped at a daily usage limit of 100,000 requests (this will not be increased). API keys expire automatically after three months.
  2. Public Interest Project licenses are capped at a daily usage limit of 100,000 requests, which may be increased on request if necessary for the project.

Registration is required to access the MLS Query API. Whether a project meets the eligibility criteria for a license is at Mozilla’s sole discretion.

Your Obligations

You represent and warrant that:

  1. Relationship with Mozilla. You will provide accurate information and updates to Mozilla. Unless you and Mozilla have a written agreement stating otherwise, your project will not imply in any way that it is produced, sponsored or endorsed by Mozilla.
  2. Relationship with End-Users. You are solely responsible for your project and obtaining meaningful consent of your End-Users to locate them. You will provide your End-Users with notice of your use of the MLS Query API, as well as any other relevant location data you have or collect in connection with its use.

Privacy Notice & Communications

As part of using the MLS Query API, you agree to the following:

  1. Data Collection - We adhere to the practices outlined in the Mozilla privacy policy for how we receive, handle and share information we collect providing MLS. The following data is required for use of our service: Name, Email, Organization (as part of registration). Mozilla retains aggregate data of the number of daily requests associated with each API key. MLS’s end user privacy notice is available here. The project’s source code is available on GitHub.
  2. Email – We may contact you at your registered email address in connection with MLS.
  3. Public Reports – We may publicly publish metrics on usage of the MLS Query API and this aggregate data may include your project use. We will not share your project name without your prior consent.


These Terms are not a service level agreement and Mozilla is not required to maintain any particular level or service or uptime in connection with MLS. The service may experience downtime or become unavailable without notice.


You agree to defend, indemnify and hold harmless Mozilla, its contractors, contributors, licensors, and partners, and their respective directors, officers, employees and agents ("Indemnified Parties") from and against any and all third party claims and expenses, including attorneys' fees, arising out of or related to your use of the Services (including, but not limited to, from any content uploaded by you).

Disclaimer; Limitation of Liability

MLS is provided "as is" with all faults. To the extent permitted by law, Mozilla and the indemnified parties hereby disclaim all warranties, whether express or implied, including without limitation warranties that the service is free of defects, merchantable, fit for a particular purpose, and non-infringing.

You bear the entire risk as to selecting the service for your purposes and as to the quality and performance of the service. This limitation will apply notwithstanding the failure of essential purpose of any remedy. Some jurisdictions do not allow the exclusion or limitation of implied warranties, so this disclaimer may not apply to you.

Except as required by law, Mozilla and the indemnified parties will not be liable for any indirect, special, incidental, consequential, or exemplary damages arising out of or in any way relating to these Terms or the use of or inability to use the service, including without limitation direct and indirect damages for loss of goodwill, work stoppage, lost profits, loss of data, and computer failure or malfunction, even if advised of the possibility of such damages and regardless of the theory (contract, tort, or otherwise) upon which such claim is based. The collective liability of Mozilla and the indemnified parties under these terms will not exceed $500 (five hundred dollars). Some jurisdictions do not allow the exclusion or limitation of incidental, consequential, or special damages, so this exclusion and limitation may not apply to you.

Modifications to these Terms

We may update these Terms from time to time. The updated Terms will be posted online. If the changes are substantive, we will announce the update through our usual channels for such announcements such as blog posts, banners, emails, or forums. Your continued use of the service after the effective date of such changes constitutes your acceptance of such changes.


These Terms constitute the entire agreement between you and Mozilla concerning the service and supersede any prior versions of these Terms. These Terms are governed by the laws of the state of California, U.S.A., excluding its conflict of law provisions. All claims and disputes arising out of the Communications or these Terms shall be brought exclusively in the courts of Santa Clara County, California, and you consent to personal jurisdiction in those courts. If any portion of these Terms is held to be invalid or unenforceable, the remaining portions will remain in full force and effect. In the event of a conflict between a translated version of these Terms and the English language version, the English language version shall control. In the event of a conflict between these Terms and relevant additional terms, the additional terms shall control.