
Addoncrop
Plugins Addons Extensions
Opera Add-ons
Chrome Web Store
CRX4Chrome
Browser-extensions.club
extensions.af
Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more.

Postio.co.uk
Ideal postcodes
Fetchify
Smarty
Data8 UK
ZIP Code API
Data8 UK PredictiveAddress
The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.

Which is more popular?
Website, pricing, platforms and company facts side by side.
|
|
|
|
|---|---|---|
| Website | addons.mozilla.org | postaldatapi.com |
| Pricing | — | |
| Company | — | Startup from the United States · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Mozilla Add-ons yet.
PostalDataPI is a global postal code validation and enrichment API covering 240+ countries and territories. One API, one key, one flat rate — $0.000028 per query with no tiers or subscriptions. What you get back: Up to 18 metadata fields per postal code — city, state/region, coordinates,...
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of Mozilla Add-ons yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Best Mozilla Add-ons.FLV
PostalDataPI Now Returns 18 Fields Per Postal Code — for 240+ Countries
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Mozilla Add-ons and PostalDataPI. For example, how are they different and which one is better?
When comparing Mozilla Add-ons and PostalDataPI, you can also consider the following products.

Extends the functionality of your web browser
Compare Addoncrop to Mozilla Add-ons or PostalDataPI:

Fast UK address, email & phone validation APIs for developers. Official Royal Mail PAF data. Pay as you go, 100 free lookups.
Compare Postio.co.uk to Mozilla Add-ons or PostalDataPI:

Plugins Addons Extensions is a platform that provides a one-stop-shop for all the latest Chrome extensions that can help you to run your business.
Compare Plugins Addons Extensions to Mozilla Add-ons or PostalDataPI:

We help businesses improve UX and data quality with a cutting edge address validation service.
Compare Ideal postcodes to Mozilla Add-ons or PostalDataPI:

Get extensions and themes for the http://alternativeto.net/software/opera browser.
Compare Opera Add-ons to Mozilla Add-ons or PostalDataPI:

Fetchify delivers fast, accurate address, email, phone and bank validation tools that help businesses capture clean, verified customer data, reduce failed deliveries and improve checkout experiences worldwide.
Compare Fetchify to Mozilla Add-ons or PostalDataPI: