diff --git a/README.md b/README.md
index 7f21262..4bf5c83 100644
--- a/README.md
+++ b/README.md
@@ -2,9 +2,14 @@
 
 This package includes functions to process the telemetry.
 
+# Download Data
+
+The `DownloadData` function will fetch data about the number of
+downloads from the Chrome and Firefox extension stores.
+
 # Retention Data
 
 The [`RetentionData`][] will calculate how many users have been using the
 extension for one day or two days in the last 28 days.
 
-[`RetentionData`]: https://github.com/webhintio/hint/issues/3074
\ No newline at end of file
+[`RetentionData`]: https://github.com/webhintio/hint/issues/3074
diff --git a/function-install-data/function.json b/function-install-data/function.json
new file mode 100644
index 0000000..3de905e
--- /dev/null
+++ b/function-install-data/function.json
@@ -0,0 +1,11 @@
+{
+  "bindings": [
+    {
+      "name": "processDailyInstalls",
+      "type": "timerTrigger",
+      "direction": "in",
+      "schedule": "0 0 11 * * *"
+    }
+  ],
+  "scriptFile": "../dist/src/install-data/index.js"
+}
diff --git a/package-lock.json b/package-lock.json
index 8b89388..97beba7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -491,6 +491,15 @@
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       "dev": true
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+    "@types/puppeteer": {
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+      "dev": true,
+      "requires": {
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       "dev": true
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@@ -790,6 +807,11 @@
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+    },
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-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
-      "dev": true
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-      "dev": true
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-      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
-      "dev": true
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
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+          "requires": {
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+      "resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-4.2.8.tgz",
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@@ -2433,6 +2502,32 @@
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@@ -2479,6 +2574,14 @@
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@@ -3699,6 +3817,11 @@
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@@ -4904,8 +5044,7 @@
     "safe-buffer": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
-      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
-      "dev": true
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
     },
     "safer-buffer": {
       "version": "2.1.2",
@@ -5540,6 +5679,11 @@
       "integrity": "sha512-DWkS49EQKVX//Tbupb9TFa19c7+MK1XmzkrZUR8TAktmE/DizXoaoJV6TZ/tSIPXipqNiRI6CyAe7x69Jb6RSw==",
       "dev": true
     },
+    "typedarray": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
+      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
+    },
     "typedarray-to-buffer": {
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
@@ -5732,8 +5876,7 @@
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
-      "dev": true
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
     "uuid": {
       "version": "3.3.3",
@@ -5921,6 +6064,14 @@
         "typedarray-to-buffer": "^3.1.5"
       }
     },
+    "ws": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
+      "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
+      "requires": {
+        "async-limiter": "~1.0.0"
+      }
+    },
     "x-is-string": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/x-is-string/-/x-is-string-0.1.0.tgz",
@@ -6046,6 +6197,14 @@
       "requires": {
         "camelcase": "^4.1.0"
       }
+    },
+    "yauzl": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.4.1.tgz",
+      "integrity": "sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=",
+      "requires": {
+        "fd-slicer": "~1.0.1"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index bb2ed15..42fc0be 100644
--- a/package.json
+++ b/package.json
@@ -13,13 +13,15 @@
   "description": "Package containing functions to calculated telemetry information.",
   "dependencies": {
     "applicationinsights": "^1.5.0",
-    "got": "^9.6.0"
+    "got": "^9.6.0",
+    "puppeteer": "^2.0.0"
   },
   "devDependencies": {
     "@azure/functions": "^1.0.3",
     "@types/got": "^9.6.7",
     "@types/node": "^12.11.7",
     "@types/proxyquire": "^1.3.28",
+    "@types/puppeteer": "^1.20.2",
     "@types/sinon": "^7.5.0",
     "@typescript-eslint/eslint-plugin": "^2.5.0",
     "@typescript-eslint/parser": "^2.5.0",
diff --git a/src/install-data/auth.ts b/src/install-data/auth.ts
new file mode 100644
index 0000000..3a38729
--- /dev/null
+++ b/src/install-data/auth.ts
@@ -0,0 +1,42 @@
+import { Page } from 'puppeteer';
+
+// TODO: Store in Azure Vault instead
+const email = process.env.WEBHINT_STATS_EMAIL!; // eslint-disable-line no-process-env
+const password = process.env.WEBHINT_STATS_PASSWORD!; // eslint-disable-line no-process-env
+const chromeAuthUrl = 'https://chrome.google.com/webstore/developer/dashboard';
+const firefoxAuthUrl = 'https://addons.mozilla.org/en-US/developers/';
+
+const delay = (ms: number) => {
+    return new Promise((resolve) => {
+        setTimeout(resolve, ms);
+    });
+};
+
+const signIn = async (page: Page) => {
+    await page.waitForSelector('input[type=password]');
+    await page.type('input[type=email]', email);
+    await page.keyboard.press(String.fromCharCode(13));
+    await delay(1000);
+    await page.waitForSelector('input[type=password]');
+    await page.type('input[type=password]', password);
+
+    await Promise.all([
+        await page.keyboard.press(String.fromCharCode(13)),
+        await page.waitForNavigation()
+    ]);
+};
+
+export const signInChrome = async (page: Page) => {
+    await page.goto(chromeAuthUrl);
+    await signIn(page);
+};
+
+export const signInFirefox = async (page: Page) => {
+    await page.goto(firefoxAuthUrl);
+    await page.click('.DevHub-Navigation-Open');
+    await Promise.all([
+        page.click('.DevHub-Navigation-Register .Button'),
+        page.waitForNavigation()
+    ]);
+    await signIn(page);
+};
diff --git a/src/install-data/chrome.ts b/src/install-data/chrome.ts
new file mode 100644
index 0000000..acccee2
--- /dev/null
+++ b/src/install-data/chrome.ts
@@ -0,0 +1,40 @@
+import { BrowserInstallHistory } from './stats';
+
+export type ChromeValue<T> = {
+    v: T;
+};
+
+export type ChromeInstalls = {
+    c: [
+        /** Date with zero-based month (e.g. in `"Date(2019,7,1)"` `7` = August) */
+        ChromeValue<string>,
+        /** Impressions */
+        ChromeValue<number>,
+        /** Installs */
+        ChromeValue<number>
+    ];
+};
+
+export type ChromeInstallHistory = {
+    table: {
+        rows: ChromeInstalls[];
+    };
+};
+
+export const normalizeChromeInstalls = (chromeInstallHistory: ChromeInstallHistory) => {
+    const browserInstallHistory: BrowserInstallHistory = {};
+
+    for (const chromeInstalls of chromeInstallHistory.table.rows) {
+        // e.g. `[2019, 7, 1]`
+        const dateParts: [number, number, number] = chromeInstalls.c[0].v
+            .replace(/Date\(|\)/g, '')
+            .split(',')
+            .map(Number) as any;
+
+        const dateString = new Date(Date.UTC(...dateParts)).toISOString();
+
+        browserInstallHistory[dateString] = chromeInstalls.c[2].v;
+    }
+
+    return browserInstallHistory;
+};
diff --git a/src/install-data/firefox.ts b/src/install-data/firefox.ts
new file mode 100644
index 0000000..a16e981
--- /dev/null
+++ b/src/install-data/firefox.ts
@@ -0,0 +1,18 @@
+import { BrowserInstallHistory } from './stats';
+
+export type FirefoxInstalls = {
+    count: number;
+    date: string;
+};
+
+export const normalizeFirefoxInstalls = (firefoxInstallHistory: FirefoxInstalls[]) => {
+    const browserInstallHistory: BrowserInstallHistory = {};
+
+    for (const firefoxInstalls of firefoxInstallHistory) {
+        const dateString = new Date(`${firefoxInstalls.date}Z`).toISOString();
+
+        browserInstallHistory[dateString] = firefoxInstalls.count;
+    }
+
+    return browserInstallHistory;
+};
diff --git a/src/install-data/index.ts b/src/install-data/index.ts
new file mode 100644
index 0000000..a90f16c
--- /dev/null
+++ b/src/install-data/index.ts
@@ -0,0 +1,9 @@
+import { AzureFunction, Context } from '@azure/functions';
+
+import { getStats } from './stats';
+
+const processInstallData: AzureFunction = async function (context: Context, myTimer: any): Promise<void> {
+    await getStats();
+};
+
+export default processInstallData;
diff --git a/src/install-data/stats.ts b/src/install-data/stats.ts
new file mode 100644
index 0000000..20c945b
--- /dev/null
+++ b/src/install-data/stats.ts
@@ -0,0 +1,45 @@
+import { launch, Page } from 'puppeteer';
+
+import { signInChrome, signInFirefox } from './auth';
+
+export type BrowserInstallHistory = { [date: string]: number };
+
+const today = new Date()
+    .toISOString()
+    .split('T')[0];
+const queryEnd = today.replace(/-/g, '');
+const chromeStatsUrl = 'https://chrome.google.com/webstore/developer/data?tq=base_stats%3Agccemnpihkbgkdmoogenkbkckppadcag&tqx=out%3Ajson';
+const firefoxStatsUrl = `https://addons.mozilla.org/en-US/firefox/addon/webhint/statistics/downloads-day-20190501-${queryEnd}.json`;
+
+const getBrowserStats = async (page: Page, url: string) => {
+    page.goto(url);
+
+    const response = await page.waitForResponse(url);
+
+    return await response.json();
+};
+
+const getChromeStats = async (page: Page) => {
+    await signInChrome(page);
+
+    return getBrowserStats(page, chromeStatsUrl);
+};
+
+const getFirefoxStats = async (page: Page) => {
+    await signInFirefox(page);
+
+    return getBrowserStats(page, firefoxStatsUrl);
+};
+
+export const getStats = async () => {
+    const browser = await launch({ headless: false });
+    const pages = await browser.pages();
+    const page = pages[0];
+
+    const chrome = await getChromeStats(page);
+    const firefox = await getFirefoxStats(page);
+
+    await browser.close();
+
+    return { chrome, firefox };
+};
diff --git a/tests/install-data/chrome.ts b/tests/install-data/chrome.ts
new file mode 100644
index 0000000..bd71b81
--- /dev/null
+++ b/tests/install-data/chrome.ts
@@ -0,0 +1,24 @@
+import * as fs from 'fs';
+import * as path from 'path';
+import test from 'ava';
+
+import { normalizeChromeInstalls } from '../../src/install-data/chrome';
+
+const rawStats = JSON.parse(fs.readFileSync(path.join(__dirname, 'fixtures', 'chrome.json'), 'utf-8')); // eslint-disable-line no-sync
+
+test('It can normalize install data from Chrome', (t) => {
+    const stats = normalizeChromeInstalls(rawStats);
+
+    t.deepEqual(stats, {
+        '2019-10-01T00:00:00.000Z': 51,
+        '2019-10-02T00:00:00.000Z': 32,
+        '2019-10-03T00:00:00.000Z': 102,
+        '2019-10-04T00:00:00.000Z': 46,
+        '2019-10-05T00:00:00.000Z': 7,
+        '2019-10-06T00:00:00.000Z': 19,
+        '2019-10-07T00:00:00.000Z': 29,
+        '2019-10-08T00:00:00.000Z': 35,
+        '2019-10-09T00:00:00.000Z': 23,
+        '2019-10-10T00:00:00.000Z': 21
+    });
+});
diff --git a/tests/install-data/firefox.ts b/tests/install-data/firefox.ts
new file mode 100644
index 0000000..139d5d8
--- /dev/null
+++ b/tests/install-data/firefox.ts
@@ -0,0 +1,24 @@
+import * as fs from 'fs';
+import * as path from 'path';
+import test from 'ava';
+
+import { normalizeFirefoxInstalls } from '../../src/install-data/firefox';
+
+const rawStats = JSON.parse(fs.readFileSync(path.join(__dirname, 'fixtures', 'firefox.json'), 'utf-8')); // eslint-disable-line no-sync
+
+test('It can normalize install data from Firefox', (t) => {
+    const stats = normalizeFirefoxInstalls(rawStats);
+
+    t.deepEqual(stats, {
+        '2019-10-01T00:00:00.000Z': 147,
+        '2019-10-02T00:00:00.000Z': 128,
+        '2019-10-03T00:00:00.000Z': 159,
+        '2019-10-04T00:00:00.000Z': 85,
+        '2019-10-05T00:00:00.000Z': 47,
+        '2019-10-06T00:00:00.000Z': 30,
+        '2019-10-07T00:00:00.000Z': 79,
+        '2019-10-08T00:00:00.000Z': 195,
+        '2019-10-09T00:00:00.000Z': 100,
+        '2019-10-10T00:00:00.000Z': 112
+    });
+});
diff --git a/tests/install-data/fixtures/chrome.json b/tests/install-data/fixtures/chrome.json
new file mode 100644
index 0000000..c0aee79
--- /dev/null
+++ b/tests/install-data/fixtures/chrome.json
@@ -0,0 +1,169 @@
+{
+    "version": "0.6",
+    "status": "ok",
+    "sig": "810059606",
+    "table": {
+        "cols": [
+            {
+                "id": "date",
+                "label": "Date",
+                "type": "date",
+                "pattern": ""
+            },
+            {
+                "id": "gccemnpihkbgkdmoogenkbkckppadcagImpressionsAll",
+                "label": "Impressions",
+                "type": "number",
+                "pattern": "",
+                "p": {
+                    "item": "webhint",
+                    "metric": "Impressions",
+                    "source": "All Sources"
+                }
+            },
+            {
+                "id": "gccemnpihkbgkdmoogenkbkckppadcagInstallationsAll",
+                "label": "Installations",
+                "type": "number",
+                "pattern": "",
+                "p": {
+                    "item": "webhint",
+                    "metric": "Installations",
+                    "source": "All Sources"
+                }
+            }
+        ],
+        "rows": [
+            {
+                "c": [
+                    {
+                        "v": "Date(2019,9,1)"
+                    },
+                    {
+                        "v": 41
+                    },
+                    {
+                        "v": 51
+                    }
+                ]
+            },
+            {
+                "c": [
+                    {
+                        "v": "Date(2019,9,2)"
+                    },
+                    {
+                        "v": 18
+                    },
+                    {
+                        "v": 32
+                    }
+                ]
+            },
+            {
+                "c": [
+                    {
+                        "v": "Date(2019,9,3)"
+                    },
+                    {
+                        "v": 84
+                    },
+                    {
+                        "v": 102
+                    }
+                ]
+            },
+            {
+                "c": [
+                    {
+                        "v": "Date(2019,9,4)"
+                    },
+                    {
+                        "v": 34
+                    },
+                    {
+                        "v": 46
+                    }
+                ]
+            },
+            {
+                "c": [
+                    {
+                        "v": "Date(2019,9,5)"
+                    },
+                    {
+                        "v": 12
+                    },
+                    {
+                        "v": 7
+                    }
+                ]
+            },
+            {
+                "c": [
+                    {
+                        "v": "Date(2019,9,6)"
+                    },
+                    {
+                        "v": 18
+                    },
+                    {
+                        "v": 19
+                    }
+                ]
+            },
+            {
+                "c": [
+                    {
+                        "v": "Date(2019,9,7)"
+                    },
+                    {
+                        "v": 33
+                    },
+                    {
+                        "v": 29
+                    }
+                ]
+            },
+            {
+                "c": [
+                    {
+                        "v": "Date(2019,9,8)"
+                    },
+                    {
+                        "v": 45
+                    },
+                    {
+                        "v": 35
+                    }
+                ]
+            },
+            {
+                "c": [
+                    {
+                        "v": "Date(2019,9,9)"
+                    },
+                    {
+                        "v": 84
+                    },
+                    {
+                        "v": 23
+                    }
+                ]
+            },
+            {
+                "c": [
+                    {
+                        "v": "Date(2019,9,10)"
+                    },
+                    {
+                        "v": 83
+                    },
+                    {
+                        "v": 21
+                    }
+                ]
+            }
+        ]
+    }
+}
\ No newline at end of file
diff --git a/tests/install-data/fixtures/firefox.json b/tests/install-data/fixtures/firefox.json
new file mode 100644
index 0000000..a1d4e11
--- /dev/null
+++ b/tests/install-data/fixtures/firefox.json
@@ -0,0 +1,52 @@
+[
+    {
+        "count": 112,
+        "date": "2019-10-10",
+        "end": "2019-10-10"
+    },
+    {
+        "count": 100,
+        "date": "2019-10-09",
+        "end": "2019-10-09"
+    },
+    {
+        "count": 195,
+        "date": "2019-10-08",
+        "end": "2019-10-08"
+    },
+    {
+        "count": 79,
+        "date": "2019-10-07",
+        "end": "2019-10-07"
+    },
+    {
+        "count": 30,
+        "date": "2019-10-06",
+        "end": "2019-10-06"
+    },
+    {
+        "count": 47,
+        "date": "2019-10-05",
+        "end": "2019-10-05"
+    },
+    {
+        "count": 85,
+        "date": "2019-10-04",
+        "end": "2019-10-04"
+    },
+    {
+        "count": 159,
+        "date": "2019-10-03",
+        "end": "2019-10-03"
+    },
+    {
+        "count": 128,
+        "date": "2019-10-02",
+        "end": "2019-10-02"
+    },
+    {
+        "count": 147,
+        "date": "2019-10-01",
+        "end": "2019-10-01"
+    }
+]
\ No newline at end of file