diff --git a/releases/firefox.json b/releases/firefox.json
new file mode 100644
index 00000000..a24e1e5f
--- /dev/null
+++ b/releases/firefox.json
@@ -0,0 +1,503 @@
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+  "3.6.11": "2010-10-19",
+  "3.5.14": "2010-10-19",
+  "3.6.10": "2010-09-15",
+  "3.5.13": "2010-09-15",
+  "3.6.9": "2010-09-07",
+  "3.5.12": "2010-09-07",
+  "3.6.8": "2010-07-23",
+  "3.6.7": "2010-07-20",
+  "3.5.11": "2010-07-20",
+  "3.6.6": "2010-06-26",
+  "3.6.4": "2010-06-22",
+  "3.5.10": "2010-06-22",
+  "3.6.3": "2010-04-01",
+  "3.5.9": "2010-03-30",
+  "3.0.19": "2010-03-30",
+  "3.6.2": "2010-03-22",
+  "3.5.8": "2010-02-17",
+  "3.0.18": "2010-02-17",
+  "3.6": "2010-01-21",
+  "3.5.7": "2010-01-05",
+  "3.0.17": "2010-01-05",
+  "3.5.6": "2009-12-15",
+  "3.0.16": "2009-12-15",
+  "3.5.5": "2009-11-05",
+  "3.5.4": "2009-10-27",
+  "3.0.15": "2009-10-27",
+  "3.5.3": "2009-09-09",
+  "3.0.14": "2009-09-09",
+  "3.5.2": "2009-08-03",
+  "3.0.13": "2009-08-03",
+  "3.0.12": "2009-07-21",
+  "3.5.1": "2009-07-16",
+  "3.5": "2009-06-30",
+  "3.0.11": "2009-06-11",
+  "3.0.10": "2009-04-27",
+  "3.0.9": "2009-04-21",
+  "3.0.8": "2009-03-27",
+  "3.0.7": "2009-03-04",
+  "3.0.6": "2009-02-03",
+  "3.0.5": "2008-12-16",
+  "3.0.4": "2008-11-12",
+  "3.0.3": "2008-09-26",
+  "3.0.2": "2008-09-23",
+  "3.0.1": "2008-07-16",
+  "3.0": "2008-06-17"
+}
\ No newline at end of file
diff --git a/src/firefox.py b/src/firefox.py
new file mode 100644
index 00000000..a95717a5
--- /dev/null
+++ b/src/firefox.py
@@ -0,0 +1,153 @@
+import json
+from typing import Tuple
+from datetime import datetime
+import re
+import requests
+import urllib.request
+from bs4 import BeautifulSoup
+import concurrent.futures
+
+"""Fetch Firefox versions with their dates from https://www.mozilla.org/en-US/firefox/releases/"""
+URL = "https://www.mozilla.org/en-US/firefox/releases/"
+PRODUCT = "firefox"
+
+DATE_REGEX = r"(January|Jan|February|Feb|March|Mar|April|Apr|May|June|Jun|July|Jul|August|Aug|September|Sept|October|Oct|November|Nov|December|Dec)\s+\d{1,2}(st|nd|rd|th)?,\s+\d{4}"
+VERSION_REGEX = r"\d+(\.\d+)*"
+
+class UnsupportedReleasePageError(Exception):
+    "Raised when a firefox release page is not supported"
+    pass
+
+class InvalidPageVariantError(Exception):
+    "Raised when an invalid variant is passed to get_version_and_date"
+    pass
+
+def format_date(unformatted_date: str) -> str:
+    """ Format date from July 11, 2002 to 2002-07-11 """
+    date = re.sub(r'(\d)(st|nd|rd|th)', r'\1', unformatted_date)
+    formats = ["%b %d, %Y", "%B %d, %Y"]
+    for f in formats:
+        try:
+            return datetime.strptime(date, f).strftime("%Y-%m-%d")
+        except ValueError:
+            pass
+    return ""
+
+def get_version_and_date_varant_1(soup: BeautifulSoup) -> Tuple[str, str]:
+    """ Version matching for firefox versions >= 28.0 (usually) """
+    # get version
+    version = soup.find("div", class_="c-release-version").get_text()
+
+    # get date
+    unformatted_date = soup.find("p", class_="c-release-date").get_text()
+    date = format_date(unformatted_date)
+
+    return (version, date)
+
+def get_version_and_date_variant_2(soup: BeautifulSoup) -> Tuple[str, str]:
+    """ Version matching for firefox versions >= 10.0 (usually) """
+    release_info = soup.find("h2").find("small").text
+
+    # get version
+    version_match = re.search(VERSION_REGEX, soup.select('div#nav-access a')[0].get("href"))
+    if version_match is None:
+        raise InvalidPageVariantError("Unable to find version")
+    version = version_match.group()
+
+    # get date
+    unformatted_date_match = re.search(DATE_REGEX, release_info)
+    if unformatted_date_match is None:
+        raise InvalidPageVariantError("Unable to find date")
+    unformatted_date = unformatted_date_match.group()
+    date = format_date(unformatted_date)
+
+    return (version, date)
+
+def get_version_and_date_variant_3(soup: BeautifulSoup) -> Tuple[str, str]:
+    """ Version matching for firefox versions >= 3.0 (usually) """
+    release_info = soup.select('div#main-feature p em')[0].get_text()
+
+    # get version
+    version_match = re.search(VERSION_REGEX, release_info)
+    if version_match is None:
+        raise InvalidPageVariantError("Unable to find version")
+    version = version_match.group()
+
+    # get date
+    unformatted_date_match = re.search(DATE_REGEX, release_info)
+    if unformatted_date_match is None:
+        raise InvalidPageVariantError("Unable to find date")
+    unformatted_date = unformatted_date_match.group()
+    date = format_date(unformatted_date)
+
+    return (version, date)
+
+def get_version_and_date(release_page: str, release_version: str) -> Tuple[str, str]:
+    """ Get version and date from the given release page """
+    major = int(release_version.split(".")[0])
+
+    # firefox release pages for versions <3.0 don't include release dates so we
+    # can't match these versions for now.
+    # example: https://www.mozilla.org/en-US/firefox/2.0/releasenotes/
+    if major < 3:
+        raise UnsupportedReleasePageError("Unsupported release page: %s" % release_page)
+
+    # Firefox release pages come in 3 different variants. Unforunately, there is no
+    # consistent way to determine which variant a page is (say, by version number), so
+    # we have to try each variant until we find one that works.
+    functions = [get_version_and_date_varant_1, get_version_and_date_variant_2, get_version_and_date_variant_3]
+    soup = make_bs_request(release_page)
+
+    for function in functions:
+        try:
+            return function(soup)
+        except (InvalidPageVariantError, AttributeError, IndexError):
+            pass
+
+    raise UnsupportedReleasePageError("Unable to find version and date for %s" % release_page)
+
+def make_bs_request(url: str) -> BeautifulSoup:
+    """ Make a request to the given url and return a BeautifulSoup object """
+    headers = {"user-agent": "mozilla"}
+    req = urllib.request.Request(url, headers=headers)
+    res = urllib.request.urlopen(req, timeout=5)
+    return BeautifulSoup(res.read(), features="html5lib")
+
+def fetch_releases():
+    releases = {}
+    soup = make_bs_request(URL)
+
+    ff_releases = soup.find_all("ol", class_="c-release-list")
+    with concurrent.futures.ThreadPoolExecutor() as executor:
+        future_to_url = {
+            executor.submit(
+                get_version_and_date,
+                requests.compat.urljoin(URL, p.get("href")),
+                p.get_text()): p.get("href") for p in ff_releases[0].find_all("a")
+        }
+
+        for future in concurrent.futures.as_completed(future_to_url):
+            try:
+                (version, date) = future.result()
+                print("%s: %s" % (version, date))
+                releases[version] = date
+            except UnsupportedReleasePageError:
+                print("Unsupported release page: %s" % future_to_url[future])
+
+    return releases
+
+def main():
+    print(f"::group::{PRODUCT}")
+
+    releases = fetch_releases()
+    with open(f"releases/{PRODUCT}.json", "w") as f:
+        f.write(json.dumps(dict(
+            # sort by date then version (desc)
+            sorted(releases.items(), key=lambda x: (x[1], x[0]), reverse=True)
+        ), indent=2))
+
+    print("::endgroup::")
+
+
+if __name__ == '__main__':
+    main()