Donor FAQ

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Below are the most frequently asked questions about donating to the Mozilla Foundation. If your question and answer are not listed here, please contact us at

What are the ways I can donate?

Visit this link to make a secure online donation right now via credit card or PayPal. For additional ways to give -- like check, bitcoin, or bank transfer -- visit our Ways to Give page.

How does Mozilla ensure my personal information is protected?

We care about the privacy of our donors and take our Privacy Principles seriously. Mozilla believes individuals should be in control of their data, and maintains multi-layered security controls and practices. To learn more, read the Mozilla Privacy Policy.

In certain instances, when you donate to Mozilla via a third party like PayPal or Stripe, those organizations also collect user data.

Why do you need my address in order to process a donation?

We understand that your privacy is very important. We ask for a minimum amount of information required to process credit card donations, including billing addresses. This allows our payment processor to verify your identity, process your payment, and prevent fraudulent charges to your credit card. We keep your information private -- if you have questions, please refer to our Privacy Policy. If you would rather not fill in your information on our online donation form, you can mail a check or donate directly via Paypal.

Where do I send a check/cheque?

Please send your check to:

Mozilla Foundation
331 East Evelyn Avenue,
Mountain View, CA 94041

All checks issued in Canadian dollars will be subject to a $5 bank processing fee imposed on Mozilla per each check processed by our bank for deposit.

If you reside outside the USA and Canada and wish to write us a check in a currency other than USD and CAD, please note our bank charges us $45 USD to process each check issued in currency other than US or Canadian dollars.

Can I donate bitcoin?

Yes! To contribute via bitcoin, please visit this link. For questions about donating bitcoin, please visit our Bitcoin FAQ.

How can I turn off the donation ask on the Firefox start page?

The fundraising campaign will end December 31st, but you can turn off the fundraising promotion by clicking the “X” on the page. Click here for instructions.

We want to protect the privacy and data that belongs to our donors, which means we limit how much "tracking" information and data we send across systems. This protects your sensitive data, but also means we can’t customize the Firefox start page once you have donated.

How will my donation be used?

At Mozilla, doing good is part of our code. To learn how your donation is put to use, click here.

You can find more details about Mozilla’s expenditures and governance here.

Don't Mozilla products, like Firefox, earn income?

Firefox is maintained by the Mozilla Corporation, a wholly-owned subsidiary of the Mozilla Foundation. While Firefox does produce revenue -- chiefly through search partnerships -- this earned income is largely reinvested back into the Corporation. The Mozilla Foundation's education and advocacy efforts, which span several continents and reach millions of people, are supported by philanthropic donations.

Read more about the distinction here.

Who donates to Mozilla?

Last year, more than 400,000 individuals gave to Mozilla to protect and improve the health of the internet. The Mozilla Foundation also receives support in the form of grants from other major foundations, like Knight, MacArthur and Ford.

Does my donation give me access to tech support?

Anyone can access tech support for Mozilla’s products by visiting the support forum. Mozilla does not provide tech support or enhanced tech support in exchange for donation.

Is my donation tax deductible?

Contributions go to the Mozilla Foundation, a 501(c)(3) organization, to be used in its discretion for its charitable purposes. They are tax-deductible in the U.S. to the fullest extent permitted by law. The Mozilla Foundation Tax ID is 20-0097189.

For donors outside of the United States, please consult with your tax adviser about whether your donation is tax deductible.

In the case of some substantial gifts, we may be required to report names and addresses to the IRS. Mozilla is required by law to report this information for its substantial donors and for cash equivalent in-kind gifts, like stocks and bitcoin, over $5,000.

How can I get a receipt for U.S. tax preparation purposes?

If you give to Mozilla through an online form, you should immediately receive an emailed receipt for your donation that you can use for your U.S. tax preparation purposes. Check your spam folder if you don’t see that email arrive in your email inbox, as it can sometimes be caught by spam filters. If you need an additional copy of your receipt for you for your U.S. tax preparation purposes, please contact us at

How do I cancel or change my recurring donation?

If you used PayPal to set up a recurring donation, you'll need to log in to your PayPal account to make changes or to cancel. If you made a monthly donation using credit card, please send an email to our support team at Include the email address and name you used to make your donation and we'll try to help you within two business days.

Can I donate in a currency other than United States dollars?

Yes. On our online form, use the drop down menu on the form to select any of over two dozen currencies.

Do you accept stock donations?

We generally accept gifts of publicly traded stock, and will consider other gifts of stock on a case-by-case basis. Please contact us at for more information. You should consult your tax adviser on the extent to which you may deduct charitable contributions of property such as stock and the documentation you need in order to claim a deduction.

I’m unable to give money at this time, are there other ways I can help Mozilla?

Absolutely! We understand that not everyone can support our mission financially, but there are many ways to help Mozilla and be a part of our community. In fact, the success of our mission depends on participation from people like you. Find the best way for you to get involved with our community here.

Who can I email directly with questions about donating?

If you have a question about donating to the Mozilla Foundation, please contact us at We will do our best to follow-up with you within 72 hours. If you need technical support for products such as Firefox, please contact Mozilla Support for assistance.