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API · /mozillaaddons-api

Mozilla Add-ons (Firefox Extensions) API

healthy 4,546 Subscribers

Live Firefox add-on stats from the official Mozilla Add-ons (AMO) API — no key, nothing stored. The adoption-and-reputation view of the Firefox ecosystem: how many users an extension or theme has, how it is rated and reviewed, and which add-ons are most popular, distinct from the other developer-ecosystem and package APIs in the catalogue. The addon endpoint returns a single add-on in full — its average daily users, weekly downloads, the star rating with review count, authors, version, type and categories. The search endpoint searches add-ons sortable by users, rating or relevance, each with its user count and rating. The top endpoint returns the most-used add-ons, optionally filtered to extensions or themes. Build extension-popularity dashboards, "is this add-on still maintained and trusted" widgets, competitor trackers and developer-portfolio tools on top of real Mozilla Add-ons data. Look up an add-on by its slug (ublock-origin, darkreader); average daily users is the headline popularity metric and the rating is the community reputation.

#developer #firefox #mozilla #extensions #addons #browser #popularity #stats
api.oanor.com/mozillaaddons-api
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Machine-readable spec so AI agents can integrate this API.

/api/mozillaaddons-api/openapi.json
/api/mozillaaddons-api/llms.txt

Discovery: GET /api/index.json lists every API.

Mozilla Add-ons (Firefox Extensions) API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
401 ms
Server probes · 24h
Subscribers
4,546
active
Total calls
76
last 7 days
status Full status page → · 8 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 24,000 calls / month
  • 3 requests / second
  • Hard cap (429 above quota, no overage)
  • 24k calls/month
  • 3 req/sec
  • All endpoints
  • No credit card
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Starter

€4.80 /month

  • 320,000 calls / month
  • 10 requests / second
  • Hard cap (429 above quota, no overage)
  • 320k calls/month
  • 10 req/sec
  • Email support
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Pro

€14.40 /month

  • 1,350,000 calls / month
  • 25 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.35M calls/month
  • 25 req/sec
  • Priority support
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Scale

€33.20 /month

  • 4,800,000 calls / month
  • 55 requests / second
  • Hard cap (429 above quota, no overage)
  • 4.8M calls/month
  • 55 req/sec
  • Dedicated SLA
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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Mozilla Add-ons (Firefox Extensions) API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Mozilla Add-ons (Firefox Extensions) API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Mozilla Add-ons (Firefox Extensions) API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Mozilla Add-ons (Firefox Extensions) API cost?
Mozilla Add-ons (Firefox Extensions) API has a free tier with 100 calls / month. Paid plans start at €4.80 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Mozilla Add-ons (Firefox Extensions) API GDPR-compliant?
All requests to Mozilla Add-ons (Firefox Extensions) API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/mozillaaddons-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/mozillaaddons-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/mozillaaddons-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/mozillaaddons-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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