diff --git a/services/atn/atn-base.js b/services/atn/atn-base.js
new file mode 100644
index 0000000000000..197d2acd0c898
--- /dev/null
+++ b/services/atn/atn-base.js
@@ -0,0 +1,34 @@
+import Joi from 'joi'
+import { nonNegativeInteger } from '../validators.js'
+import { BaseJsonService } from '../index.js'
+
+const description =
+  '[addons.thunderbird.net](https://addons.thunderbird.net) (ATN) publishes extensions for Mozilla Thunderbird'
+
+const schema = Joi.object({
+  average_daily_users: nonNegativeInteger,
+  current_version: Joi.object({
+    version: Joi.string().required(),
+  }).required(),
+  ratings: Joi.object({
+    average: Joi.number().required(),
+  }).required(),
+  weekly_downloads: nonNegativeInteger,
+}).required()
+
+class BaseAtnService extends BaseJsonService {
+  static defaultBadgeData = { label: 'thunderbird add-on' }
+
+  addonUrl({ addonId }) {
+    return `https://addons.thunderbird.net/api/v3/addons/addon/${addonId}/`
+  }
+
+  async fetch({ addonId }) {
+    return this._requestJson({
+      schema,
+      url: this.addonUrl({ addonId }),
+    })
+  }
+}
+
+export { BaseAtnService, description }
diff --git a/services/atn/atn-downloads.service.js b/services/atn/atn-downloads.service.js
new file mode 100644
index 0000000000000..f40ae960f4731
--- /dev/null
+++ b/services/atn/atn-downloads.service.js
@@ -0,0 +1,36 @@
+import { renderDownloadsBadge } from '../downloads.js'
+import { pathParams } from '../index.js'
+import { BaseAtnService, description } from './atn-base.js'
+
+export default class AtnWeeklyDownloads extends BaseAtnService {
+  static category = 'downloads'
+  static route = { base: 'atn/dw', pattern: ':addonId' }
+
+  static openApi = {
+    '/atn/dw/{addonId}': {
+      get: {
+        summary: 'Thunderbird Add-on Downloads',
+        description,
+        parameters: pathParams({
+          name: 'addonId',
+          example: 'unicodify-text-transformer',
+        }),
+      },
+    },
+  }
+
+  static _cacheLength = 21600
+
+  static defaultBadgeData = { label: 'downloads' }
+
+  static render({ downloads }) {
+    return renderDownloadsBadge({ downloads, interval: 'week' })
+  }
+
+  async handle({ addonId }) {
+    const data = await this.fetch({ addonId })
+    return this.constructor.render({
+      downloads: data.weekly_downloads,
+    })
+  }
+}
diff --git a/services/atn/atn-downloads.tester.js b/services/atn/atn-downloads.tester.js
new file mode 100644
index 0000000000000..b6c78a845c03e
--- /dev/null
+++ b/services/atn/atn-downloads.tester.js
@@ -0,0 +1,11 @@
+import { createServiceTester } from '../tester.js'
+import { isMetricOverTimePeriod } from '../test-validators.js'
+export const t = await createServiceTester()
+
+t.create('Weekly Downloads')
+  .get('/dictionary-german.json')
+  .expectBadge({ label: 'downloads', message: isMetricOverTimePeriod })
+
+t.create('Weekly Downloads (not found)')
+  .get('/not-a-real-plugin.json')
+  .expectBadge({ label: 'downloads', message: 'not found' })
diff --git a/services/atn/atn-rating.service.js b/services/atn/atn-rating.service.js
new file mode 100644
index 0000000000000..a6df5c97eb4b5
--- /dev/null
+++ b/services/atn/atn-rating.service.js
@@ -0,0 +1,50 @@
+import { starRating } from '../text-formatters.js'
+import { floorCount as floorCountColor } from '../color-formatters.js'
+import { pathParams } from '../index.js'
+import { BaseAtnService, description } from './atn-base.js'
+
+export default class AtnRating extends BaseAtnService {
+  static category = 'rating'
+  static route = { base: 'atn', pattern: ':format(stars|rating)/:addonId' }
+
+  static openApi = {
+    '/atn/rating/{addonId}': {
+      get: {
+        summary: 'Thunderbird Add-on Rating',
+        description,
+        parameters: pathParams({
+          name: 'addonId',
+          example: 'unicodify-text-transformer',
+        }),
+      },
+    },
+    '/atn/stars/{addonId}': {
+      get: {
+        summary: 'Thunderbird Add-on Stars',
+        description,
+        parameters: pathParams({
+          name: 'addonId',
+          example: 'unicodify-text-transformer',
+        }),
+      },
+    },
+  }
+
+  static _cacheLength = 7200
+
+  static render({ format, rating }) {
+    return {
+      label: format,
+      message:
+        format === 'stars'
+          ? starRating(rating)
+          : `${Math.round(rating * 10) / 10}/5`,
+      color: floorCountColor(rating, 2, 3, 4),
+    }
+  }
+
+  async handle({ format, addonId }) {
+    const data = await this.fetch({ addonId })
+    return this.constructor.render({ format, rating: data.ratings.average })
+  }
+}
diff --git a/services/atn/atn-rating.tester.js b/services/atn/atn-rating.tester.js
new file mode 100644
index 0000000000000..3c73e0098f976
--- /dev/null
+++ b/services/atn/atn-rating.tester.js
@@ -0,0 +1,19 @@
+import Joi from 'joi'
+import { isStarRating } from '../test-validators.js'
+import { createServiceTester } from '../tester.js'
+export const t = await createServiceTester()
+
+t.create('Rating')
+  .get('/rating/unicodify-text-transformer.json')
+  .expectBadge({
+    label: 'rating',
+    message: Joi.string().regex(/^\d(\.\d)?\/\d$/),
+  })
+
+t.create('Stars')
+  .get('/stars/unicodify-text-transformer.json')
+  .expectBadge({ label: 'stars', message: isStarRating })
+
+t.create('Rating (not found)')
+  .get('/rating/not-a-real-plugin.json')
+  .expectBadge({ label: 'thunderbird add-on', message: 'not found' })
diff --git a/services/atn/atn-version.service.js b/services/atn/atn-version.service.js
new file mode 100644
index 0000000000000..301eceaba3f87
--- /dev/null
+++ b/services/atn/atn-version.service.js
@@ -0,0 +1,26 @@
+import { renderVersionBadge } from '../version.js'
+import { pathParams } from '../index.js'
+import { BaseAtnService, description } from './atn-base.js'
+
+export default class AtnVersion extends BaseAtnService {
+  static category = 'version'
+  static route = { base: 'atn/v', pattern: ':addonId' }
+
+  static openApi = {
+    '/atn/v/{addonId}': {
+      get: {
+        summary: 'Thunderbird Add-on Version',
+        description,
+        parameters: pathParams({
+          name: 'addonId',
+          example: 'unicodify-text-transformer',
+        }),
+      },
+    },
+  }
+
+  async handle({ addonId }) {
+    const data = await this.fetch({ addonId })
+    return renderVersionBadge({ version: data.current_version.version })
+  }
+}
diff --git a/services/atn/atn-version.tester.js b/services/atn/atn-version.tester.js
new file mode 100644
index 0000000000000..b7f80fcaec35e
--- /dev/null
+++ b/services/atn/atn-version.tester.js
@@ -0,0 +1,12 @@
+import { isVPlusDottedVersionAtLeastOne } from '../test-validators.js'
+import { createServiceTester } from '../tester.js'
+export const t = await createServiceTester()
+
+t.create('Version').get('/unicodify-text-transformer.json').expectBadge({
+  label: 'thunderbird add-on',
+  message: isVPlusDottedVersionAtLeastOne,
+})
+
+t.create('Version (not found)')
+  .get('/not-a-real-plugin.json')
+  .expectBadge({ label: 'thunderbird add-on', message: 'not found' })
diff --git a/services/atn/atn.service.js b/services/atn/atn.service.js
new file mode 100644
index 0000000000000..14f7c62fc245c
--- /dev/null
+++ b/services/atn/atn.service.js
@@ -0,0 +1,34 @@
+import { renderDownloadsBadge } from '../downloads.js'
+import { pathParams } from '../index.js'
+import { BaseAtnService, description } from './atn-base.js'
+
+export default class AtnUsers extends BaseAtnService {
+  static category = 'downloads'
+  static route = { base: 'atn/users', pattern: ':addonId' }
+
+  static openApi = {
+    '/atn/users/{addonId}': {
+      get: {
+        summary: 'Thunderbird Add-on Users',
+        description,
+        parameters: pathParams({
+          name: 'addonId',
+          example: 'unicodify-text-transformer',
+        }),
+      },
+    },
+  }
+
+  static _cacheLength = 21600
+
+  static defaultBadgeData = { label: 'users' }
+
+  static render({ users: downloads }) {
+    return renderDownloadsBadge({ downloads, colorOverride: 'blue' })
+  }
+
+  async handle({ addonId }) {
+    const data = await this.fetch({ addonId })
+    return this.constructor.render({ users: data.average_daily_users })
+  }
+}
diff --git a/services/atn/atn.service.spec.js b/services/atn/atn.service.spec.js
new file mode 100644
index 0000000000000..b0b167592a480
--- /dev/null
+++ b/services/atn/atn.service.spec.js
@@ -0,0 +1,10 @@
+import { test, given } from 'sazerac'
+import { BaseAtnService } from './atn-base.js'
+
+describe('ATN service', function () {
+  test(BaseAtnService.prototype.addonUrl, () => {
+    given({ addonId: 'unicodify-text-transformer' }).expect(
+      'https://addons.thunderbird.net/api/v3/addons/addon/unicodify-text-transformer/',
+    )
+  })
+})
diff --git a/services/atn/atn.tester.js b/services/atn/atn.tester.js
new file mode 100644
index 0000000000000..15c69e6e94b91
--- /dev/null
+++ b/services/atn/atn.tester.js
@@ -0,0 +1,11 @@
+import { isMetric } from '../test-validators.js'
+import { createServiceTester } from '../tester.js'
+export const t = await createServiceTester()
+
+t.create('Users')
+  .get('/unicodify-text-transformer.json')
+  .expectBadge({ label: 'users', message: isMetric })
+
+t.create('Users (not found)')
+  .get('/not-a-real-plugin.json')
+  .expectBadge({ label: 'users', message: 'not found' })