Lookup as you type
Find a postcode while filling in an address. Run lookup automatically or with a click — whichever suits your workflow.
Firefox for Android
Version 0.5.0 uses the same package on desktop and Android. This version has been submitted to Mozilla Add-ons and is awaiting review. After approval, install the signed version through Mozilla Add-ons. The ZIP download is for developer testing, not a permanent Android installation.
← All extensionsA postcode for your address.
PostField · 0.5.0
A postcode for your address.
Fewer tabs to open.
Look up postcodes for Russian addresses while filling in forms. Choose a provider and keep useful addresses in local favourites.
Download PostFieldDelivery address
1 Red Square, Moscow
Postcode— — — — — —
Try Find postcode
Interactive sample: a prepared address and postcode, with no provider request.
Addresses at hand
Keep frequent addresses in local favourites. Set site exceptions and enter a postcode manually whenever you need to.
Your provider
Choose Photon / OpenStreetMap, Geoapify or DaData Clean in the extension settings.
Stable release 0.5.0
Choose your browser ZIP
Downloads from the public GitHub release. Chromium 120+ or Firefox 142+.
Connect your provider
Photon / OpenStreetMap needs no key. Geoapify uses your API key; the paid DaData Clean service uses your token and secret. Check that the postcode matches the address before submitting the form.
Chrome / Edge / Opera
- Download the matching ZIP and extract it to a separate folder.
- Open chrome://extensions, edge://extensions or opera://extensions.
- Enable developer mode, choose “Load unpacked” and select the folder containing manifest.json.
Firefox
- Download and extract the Firefox ZIP.
- Open about:debugging#/runtime/this-firefox → “Load Temporary Add-on”.
- Select manifest.json in the extracted folder.
Firefox loads this ZIP as a temporary add-on through about:debugging. Load it again after restarting the browser; permanent installation requires a signed XPI.
What happens to an address
During lookup, the extension sends the address only to your selected provider. It does not automatically switch providers. Favourites stay local.
PostField privacy policy ↗