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Michal Bryxí
Michal Bryxí

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Firefox form auto-fill


One of the trivial, yet crucial UX issues I have with the Firefox web browser is that the other browsers do absolutely smashing job in auto-filling addresses.

Basically I just fill my address in once, the browser remembers and then I can select the remembered option in any web page and 90% of the form will be filled in correctly.

It sounds trivial, but filling in my physical address is surprisingly common workflow on contemporary web.


I tried to follow the Automatically fill in your address on web forms in Firefox for Android from Mozilla, but mentioned settings options are not even available in my version (118.0b6).

After a bit of research I found out that Firefox/Features/Form Autofill contains the answer. Important: Since this article will inevitably go out of date, please refer to the linked official documentation for the correct way.


  1. In the address bar type in about:config and press enter.
  2. Search for extensions.formautofill.addresses
  3. extensions.formautofill.addresses.capture.enabled = true
  4. extensions.formautofill.addresses.capture.v2.enabled = true
    • Not exactly sure what is the difference between this and the previous one, but can't hurt?
  5. extensions.formautofill.addresses.supported = on
  6. extensions.formautofill.addresses.supportedCountries = US,CA,CH,CZ,GB
    • My country is Switzerland, therefore I added CH to this list. List of country codes follows the ISO 3166 aplha-2 code standard.
  7. Restart browser
  8. Now you should see in the Settings new item in Forms and Autofill

Forms and Autofill settings in Firefox

Now you can use try on websites like to see if it works: website with Firefox autofill toolbar


Firefox can fill in addresses in forms and does it reasonably well even in countries that are not officially supported. One just need to know where/how to enable it in settings.

Image generated via Midjourney prompt: firefox as a delivery man --ar 16:9

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