I don't know the expected timing for this feature to become available for European addresses. You can enable the feature "as is" and see whether it works reasonably well for you, or whether it makes sense to wait on that and use an add-on instead. Here's how: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. ''More info on about:config:'' [[Configuration Editor for Firefox]]. ''The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.'' (2) In the search box in the page, type or paste '''addresses.supported''' and pause while the list is filtered ''Firefox should list two preferences:'' extensions.formautofill.addresses.supported and extensions.formautofill.addresses.supportedCountries (3) Double-click the '''extensions.formautofill.addresses.supported''' preference to display an editing field, and change the value to '''on''' then press Enter or click the blue check mark button to save the change. (4) I don't know whether it is strictly necessary, but I suggest one more change: double-click the '''extensions.formautofill.addresses.supportedCountries''' preference to display an editing field, and add GB (if you are physically located in the UK). If the preference is blank, just list GB, and if it has "US,CA" already, add a comma and then GB alone. Then press Enter or click the blue check mark button to save the change. Success?