Mozilla Corporate Office, Headquarters Address & Phone Number

Mozilla is the organization behind Firefox and a range of privacy, internet, developer, and open-source initiatives. People searching for the Mozilla corporate office, Mozilla headquarters address, Firefox support, Mozilla account help, subscription billing, privacy assistance, product complaints, bug reporting, or employment information should use the contact route that matches their issue.

Mozilla Corporation’s current official corporate and legal mailing address is 1875 Mission Street, Suite 103, San Francisco, CA 94103. Mozilla publishes 1-650-903-0800 as its corporate/legal telephone number.

Mozilla Corporate Office and Headquarters Information

Mozilla Corporation

• Organization: Mozilla Corporation
• Corporate / Legal Mailing Address: 1875 Mission Street, Suite 103, San Francisco, CA 94103, USA
• Corporate Phone: 1-650-903-0800
• Fax: 1-650-903-0875
• Legal Notices Email: legal-notices@mozilla.com
• Official Website: Mozilla.org

Mozilla Corporation is the taxable subsidiary associated with Firefox and Mozilla’s commercial products and services. Mozilla’s current official legal materials identify 1875 Mission Street, Suite 103 in San Francisco as the address for Mozilla Corporation correspondence.

This is not presented as a walk-in Firefox technical-support center. Users with browser, account, subscription, VPN, Relay, Monitor, or other product problems should normally use Mozilla’s online support channels rather than traveling to or mailing the corporate address.

Mozilla Foundation

• Organization: Mozilla Foundation
• Organization Type: California nonprofit corporation and 501(c)(3) organization
• Foundation Address: 149 New Montgomery Street, 4th Floor, San Francisco, CA 94105
• Main Mozilla Phone: 1-650-903-0800
• Foundation Website: Mozilla Foundation

The New Montgomery Street address that appeared in older Mozilla corporate-office directories remains associated with the Mozilla Foundation. It should not be automatically substituted for Mozilla Corporation’s current Mission Street corporate/legal mailing address.

Mozilla Corporation vs. Mozilla Foundation

Mozilla is not simply one nonprofit company. Mozilla describes itself as a hybrid organization combining nonprofit and market-based approaches.

The structure includes:

• Mozilla Foundation: The nonprofit parent organization focused on Mozilla’s public-interest mission, advocacy, research, philanthropy, community programs, and internet-policy initiatives.
• Mozilla Corporation: A wholly owned taxable subsidiary of the Mozilla Foundation that develops and operates products including Firefox and commercial Mozilla services.

Mozilla Corporation was established in 2005. The broader Mozilla project dates to 1998.

This distinction is important when looking for a corporate address, making a donation, seeking Firefox support, contacting Mozilla about a subscription, submitting a legal notice, or researching the organization’s nonprofit status.

Use Mozilla’s official organizations page for current information about its organizational structure.

How to Contact Firefox and Mozilla Product Support

Mozilla does not publish one universal telephone technical-support number for Firefox.

For Firefox troubleshooting, Mozilla directs users to Mozilla Support, commonly called SUMO.

Mozilla Support covers products including:

• Firefox for Windows, macOS, and Linux
• Firefox for Android
• Firefox for iOS
• Firefox Focus
• Mozilla Accounts
• Mozilla VPN
• Firefox Relay
• Mozilla Monitor
• MDN Plus
• Firefox Enterprise
• Thunderbird and Thunderbird for Android support resources

The correct support method depends on the product. Some issues can be solved through Mozilla’s knowledge base and community forums, while certain account or paid-product issues provide a sign-in option to contact a support team.

Common Firefox Problems

Mozilla Support provides troubleshooting for issues including:

• Firefox crashes or freezes
• Browser startup problems
• Slow performance
• Website display problems
• Password and login issues
• Bookmarks and history
• Sync
• Extensions and add-ons
• Privacy and security settings
• Updates
• Notifications and permissions
• Mobile Firefox

For technical help, start with the Firefox Support section rather than calling the corporate phone number.

How to Escalate a Mozilla or Firefox Complaint

Mozilla does not publish a universal public complaints-department telephone number.

The appropriate escalation route depends on what the complaint involves.

1. Identify the Mozilla product. Determine whether the problem involves Firefox, Mozilla Account, Mozilla VPN, Firefox Relay, Mozilla Monitor, MDN Plus, or another service.
2. Use Mozilla Support first. Search the official knowledge base and use the support option associated with the product.
3. Save relevant documentation. Keep screenshots, error messages, subscription receipts, support conversations, browser version information, and case details.
4. Use the correct specialized route. Billing, privacy, bugs, legal notices, copyright reports, and feature requests each have different channels.
5. Do not treat the corporate number as technical support. The 1-650-903-0800 number is a corporate/legal contact and is not advertised as a Firefox troubleshooting hotline.

Information to Have Before Requesting Mozilla Support

• Mozilla product involved
• Firefox or application version
• Operating system and version
• Exact error message
• Approximate date the problem began
• Steps already attempted
• Subscription or transaction information when relevant
• Support-case information, if one has already been created
• Screenshots with private information removed

Do not post passwords, recovery codes, authentication codes, complete payment-card information, private browsing data, full email-account credentials, or other sensitive information in a public support question or review.

Firefox Support Phone Number Warning

Be cautious when searching online for a “Firefox customer service phone number,” “Mozilla tech support number,” or similar phrase.

Mozilla’s official support resources do not advertise a universal telephone technical-support line for Firefox. Search results, advertisements, pop-ups, or unsolicited messages that provide another number may belong to an unrelated third party.

Do not allow an unknown support provider to:

• Take remote control of your computer
• Ask for a Mozilla Account password
• Request a one-time authentication code
• Demand payment through gift cards, cryptocurrency, or wire transfer
• Claim that Firefox requires payment to remove a virus

Use Support.Mozilla.org directly for Firefox technical assistance.

Mozilla Account Support

A Mozilla Account can be used with multiple Mozilla products and services, including Firefox Sync and supported subscription services.

Mozilla Account concerns may involve:

• Signing in
• Password resets
• Email verification
• Two-step authentication
• Recovery codes
• Sync
• Connected devices
• Subscription access
• Account deletion

Use the Mozilla Account Help section for current instructions.

If an unexpected email claims that your Mozilla Account is being deleted, suspended, or changed, avoid using links in the message until you independently verify the account through Mozilla’s official website.

Mozilla VPN, Firefox Relay, Monitor, Billing, and Subscription Complaints

Mozilla Corporation currently offers paid and free services that include Mozilla VPN and Firefox Relay. Mozilla Monitor continues to provide data-breach monitoring, although product features and paid offerings can change.

For billing and subscription help, use Mozilla’s Billing and Subscriptions support section.

Support topics include:

• Managing subscriptions
• Updating payment information
• Canceling Mozilla VPN
• Canceling Firefox Relay
• Refund requests
• Subscription upgrades
• Payment failures
• App Store and Google Play subscription issues

If you subscribed through Apple or Google rather than directly through Mozilla, some billing or cancellation actions may need to be completed through the applicable app store.

Keep subscription confirmation emails, receipts, transaction dates, the email associated with your Mozilla Account, and previous support correspondence when disputing a charge.

Mozilla Monitor Changes

Mozilla Monitor’s basic breach-monitoring service remains available. Mozilla discontinued the separate Monitor Plus data-removal service in 2026.

If you previously used a discontinued Mozilla service, use current Mozilla Support documentation rather than relying on an older article, search result, or saved bookmark.

Pocket and Fakespot Have Shut Down

Older Mozilla information may still list Pocket and Fakespot as active Mozilla products.

Mozilla shut down:

• Fakespot: July 2025
• Pocket: July 2025, followed by the end of remaining data-export access later in 2025

These services should no longer be listed as active Mozilla consumer products in current corporate-office information.

Mozilla Privacy Questions and Data Requests

Mozilla maintains separate privacy notices for Firefox, Mozilla Accounts, subscription products, and other services.

For questions about Mozilla’s privacy practices, Mozilla currently publishes:

• Privacy and Compliance Email: compliance@mozilla.com
• Data Protection Officer: dpo@mozilla.com for applicable privacy matters
• Mozilla Privacy Information: Mozilla Privacy

Mozilla also provides a Data Subject Access Request process for people exercising applicable privacy rights involving access, correction, deletion, portability, or other personal-data requests.

Privacy requests are different from Firefox technical-support questions. Do not email the privacy or legal team for routine browser troubleshooting.

Mozilla Legal Notices and Copyright Complaints

Mozilla publishes legal-notices@mozilla.com for appropriate legal correspondence.

The current Mozilla Corporation legal mailing address is:

Mozilla Corporation
Attn: Mozilla – Legal Notices
1875 Mission Street, Suite 103
San Francisco, CA 94103

Mozilla also provides a dedicated process for copyright and trademark infringement.

For suspected copyright infringement, Mozilla currently publishes:

• DMCA Email: dmcanotice@mozilla.com
• Official Information: Report Copyright or Trademark Infringement

Do not use the legal-notices or DMCA addresses for routine Firefox support.

How to Report a Firefox Bug or Request a Feature

A technical-support problem, software bug, broken website, and feature request are different issues.

Firefox Bugs

Mozilla uses Bugzilla to track Firefox and other Mozilla software defects.

Before filing a bug:

• Search for an existing report
• Identify the Firefox version
• Describe how to reproduce the problem
• Include operating-system details
• Remove private information from screenshots or attachments

Bugzilla is generally public. Do not upload passwords, private documents, personal communications, payment information, or sensitive browsing information.

Feature Requests and Product Feedback

Mozilla directs feature ideas and product discussions to Mozilla Connect.

Mozilla Connect is more appropriate for:

• Firefox feature suggestions
• Product ideas
• User-interface feedback
• Discussion about future functionality

Broken Websites in Firefox

If a website works in another browser but appears broken in Firefox, Mozilla provides a Report Broken Site feature and Web Compatibility review process.

Use Mozilla’s broken-site reporting instructions for current guidance.

Current Mozilla Products and Services

Mozilla’s current product and support ecosystem includes:

• Firefox: Mozilla’s open-source web browser for desktop and mobile platforms
• Firefox Focus: Privacy-focused mobile browser
• Mozilla VPN: Subscription VPN service
• Firefox Relay: Email and supported phone-number masking service
• Mozilla Monitor: Data-breach monitoring service
• MDN and MDN Plus: Web-development documentation and enhanced subscriber features
• Firefox Enterprise: Firefox resources for managed organizational environments

Mozilla’s product portfolio changes over time. Use the Mozilla products page and Mozilla Support product directory for current availability.

About Mozilla

The Mozilla project began in 1998 and grew from the open-source release of Netscape browser code.

Mozilla became closely associated with Firefox, which was first released under that name in 2004. Mozilla Corporation was created in 2005 as a taxable subsidiary of the Mozilla Foundation.

Mozilla’s work has expanded beyond Firefox to include internet privacy, open-source development, web standards, developer resources, public-interest technology, policy, artificial intelligence, security, and digital rights.

Mozilla describes its broader mission around keeping the internet open and accessible and giving people greater choice and control over their online experience.

Current Mozilla leadership includes separate executives across the Mozilla family, Mozilla Foundation, and Mozilla Corporation. Use the official Mozilla leadership page for the latest executive information.

Mozilla Careers and Employment

Mozilla maintains its official job listings through the Mozilla Careers website.

Mozilla describes itself as a remote-first organization. Current roles can include:

• Firefox engineering
• Product management
• Security
• Artificial intelligence
• Marketing
• Business development
• Finance
• Legal and policy
• Infrastructure
• Design
• Mozilla Foundation positions

Mozilla also maintains gathering spaces in several cities, while many employees work remotely.

Job applicants should use the official careers site rather than sending résumés or employment questions to Firefox Support.

Mozilla Competitors and Related Corporate Office Pages

Firefox competes most directly with other major web browsers, including Google Chrome, Apple Safari, Microsoft Edge, Samsung Internet, Brave, Opera, and other browser products.

Related CorporateOfficeHeadquarters.com pages include:

• Google Corporate Office – Google develops the Chrome browser and Chromium project.
• Apple Corporate Office – Apple develops Safari for macOS, iPhone, and iPad.
• Samsung Corporate Office – Samsung develops Samsung Internet for its mobile-device ecosystem.

Official Mozilla Resources

• Mozilla Official Website
• Mozilla Contact Directory
• Mozilla Support
• Mozilla Product Support Directory
• Mozilla Billing and Subscription Help
• Mozilla Bugzilla
• Mozilla Connect
• Mozilla Privacy
• Mozilla Legal Information
• Mozilla Organization Structure
• Mozilla Leadership
• Mozilla Foundation
• Mozilla Careers

Frequently Asked Questions About Mozilla Corporate Office

Where is Mozilla Corporation located?

Mozilla Corporation’s current official corporate/legal mailing address is 1875 Mission Street, Suite 103, San Francisco, CA 94103.

What is Mozilla’s corporate phone number?

Mozilla publishes 1-650-903-0800 as its corporate/legal telephone number.

Is 520-248-6621 Mozilla’s corporate phone number?

That number appeared in older third-party Mozilla listings, but Mozilla’s current official legal and corporate materials publish 1-650-903-0800. Use the current official number rather than the older 520 listing.

Is 149 New Montgomery Street still a Mozilla address?

Yes, but the distinction matters. Mozilla Foundation’s latest available nonprofit filing lists 149 New Montgomery Street, 4th Floor, San Francisco, CA 94105. Current Mozilla Corporation legal materials use 1875 Mission Street, Suite 103, San Francisco, CA 94103.

What is the Firefox customer-service phone number?

Mozilla does not publish one universal Firefox technical-support phone number. Firefox users should use Support.Mozilla.org for official technical assistance.

How do I complain to Mozilla?

Use Mozilla Support for product issues and select the product involved. Billing, privacy, bugs, legal matters, copyright complaints, and feature requests have separate specialized routes.

How do I contact Firefox support?

Visit Firefox Support for troubleshooting articles and available support options.

How do I contact Mozilla about a VPN or Relay subscription?

Use Mozilla’s official Billing and Subscriptions support section. Some paid-product support options require signing in with the Mozilla Account associated with the subscription.

How do I report a bug in Firefox?

Mozilla uses Bugzilla for Firefox software bugs. Search existing reports before opening a new issue and do not include private data in a public bug report.

Where can I suggest a Firefox feature?

Mozilla directs product ideas and feature requests to Mozilla Connect.

How do I contact Mozilla about privacy?

Mozilla publishes compliance@mozilla.com for privacy-practice questions and provides a Data Subject Access Request process through its privacy resources. Certain applicable data-protection matters can also be directed to dpo@mozilla.com.

Is Mozilla a nonprofit?

The Mozilla Foundation is a nonprofit 501(c)(3) organization. Mozilla Corporation is a wholly owned taxable subsidiary of the Foundation. Mozilla therefore describes itself as a hybrid organization rather than simply one nonprofit corporation.

Who makes Firefox?

Firefox is developed under Mozilla, with Mozilla Corporation serving as the company behind the Firefox browser.

Does Mozilla still operate Pocket?

No. Mozilla shut down Pocket in 2025.

Does Mozilla still operate Fakespot?

No. Mozilla discontinued Fakespot in 2025.

Does Mozilla have an HR phone number?

Mozilla does not advertise a general public Human Resources phone number for job applicants. Employment candidates should use the official Mozilla Careers website.

Why Trust CorporateOfficeHeadquarters.com?

CorporateOfficeHeadquarters.com provides independently researched headquarters addresses, corporate telephone numbers, product-support routes, complaint guidance, organizational information, and reader reviews.

For Mozilla, we distinguish Mozilla Corporation from the nonprofit Mozilla Foundation and separate the corporate phone and mailing address from Firefox technical support, subscription billing, Mozilla Account help, privacy requests, Bugzilla, feature feedback, and legal notices.

Updated September 8, 2026.

Disclaimer

CorporateOfficeHeadquarters.com is not affiliated with Mozilla Corporation, Mozilla Foundation, Firefox, Mozilla VPN, Firefox Relay, Mozilla Monitor, MDN, Thunderbird, or any other Mozilla organization, project, product, or service.

This page is provided for informational, complaint, feedback, and review purposes. Corporate addresses, phone numbers, organization structure, leadership, products, subscription terms, support procedures, privacy contacts, legal addresses, and service availability may change.

Verify time-sensitive product, billing, privacy, legal, and account information directly through Mozilla’s official websites before submitting private information, sending correspondence, purchasing a subscription, or acting on an online support number.

Mozilla and Firefox Reviews, Complaints, and Feedback

Have you contacted Mozilla Corporation, Firefox Support, Mozilla Account support, Mozilla VPN support, Firefox Relay, Mozilla Monitor, or another Mozilla team? Share your experience below.

Helpful reviews can include the Mozilla product involved, operating system, general issue, support route used, approximate response time, whether a case or bug number was assigned, and whether the problem was resolved.

Please do not post passwords, recovery codes, authentication codes, personal email addresses, payment information, private browsing information, account credentials, legal documents, or other sensitive personal data in a public review.