diff --git a/setup/browser_data.py b/setup/browser_data.py
index b1196203f1..95352209dd 100644
--- a/setup/browser_data.py
+++ b/setup/browser_data.py
@@ -8,8 +8,6 @@ import sys
 from datetime import datetime
 from urllib.request import urlopen
 
-from setup import download_securely
-
 
 def download_from_calibre_server(url):
     ca = os.path.join(sys.resources_location, 'calibre-ebook-root-CA.crt')
@@ -34,49 +32,6 @@ def common_user_agents():
     return ans, list(sorted(ans, reverse=True, key=ans.__getitem__))
 
 
-def firefox_versions():
-    print('Getting firefox versions...')
-    import html5lib
-    raw = download_securely(
-        'https://www.mozilla.org/en-US/firefox/releases/').decode('utf-8')
-    root = html5lib.parse(raw, treebuilder='lxml', namespaceHTMLElements=False)
-    ol = root.xpath('//main[@id="main-content"]/ol')[0]
-    ol.xpath('descendant::li/strong/a[@href]')
-    ans = filter_ans(ol.xpath('descendant::li/strong/a[@href]/text()'))
-    if not ans:
-        raise ValueError('Failed to download list of firefox versions')
-    return ans
-
-
-def chrome_versions():
-    print('Getting chrome versions...')
-    import html5lib
-    raw = download_securely(
-        'https://en.wikipedia.org/wiki/Google_Chrome_version_history').decode('utf-8')
-    root = html5lib.parse(raw, treebuilder='lxml', namespaceHTMLElements=False)
-    table = root.xpath('//*[@id="mw-content-text"]//tbody')[-1]
-    ans = []
-    for tr in table.iterchildren('tr'):
-        cells = tuple(tr.iterchildren('td'))
-        if not cells:
-            continue
-        if not cells[2].text or not cells[2].text.strip():
-            continue
-        s = cells[0].get('style')
-        if '#a0e75a' not in s and 'salmon' not in s:
-            break
-        chrome_version = cells[0].text.strip()
-        ts = datetime.strptime(cells[1].text.strip().split()[
-                               0], '%Y-%m-%d').date().strftime('%Y-%m-%d')
-        try:
-            webkit_version = cells[2].text.strip().split()[1]
-        except IndexError:
-            continue
-        ans.append({'date': ts, 'chrome_version': chrome_version,
-                    'webkit_version': webkit_version})
-    return list(reversed(ans))
-
-
 def all_desktop_platforms(user_agents):
     ans = set()
     for ua in user_agents:
@@ -92,8 +47,6 @@ def all_desktop_platforms(user_agents):
 def get_data():
     ua_freq_map, common = common_user_agents()
     ans = {
-        'chrome_versions': chrome_versions(),
-        'firefox_versions': firefox_versions(),
         'common_user_agents': common,
         'user_agents_popularity': ua_freq_map,
         'timestamp': datetime.utcnow().isoformat() + '+00:00',
diff --git a/src/calibre/utils/random_ua.py b/src/calibre/utils/random_ua.py
index 4e69bc622b..35f46e639f 100644
--- a/src/calibre/utils/random_ua.py
+++ b/src/calibre/utils/random_ua.py
@@ -48,18 +48,10 @@ def user_agents_popularity_map():
     return user_agent_data().get('user_agents_popularity', {})
 
 
-def all_firefox_versions(limit=10):
-    return user_agent_data()['firefox_versions'][:limit]
-
-
 def random_desktop_platform():
     return random.choice(user_agent_data()['desktop_platforms'])
 
 
-def all_chrome_versions(limit=10):
-    return user_agent_data()['chrome_versions'][:limit]
-
-
 def accept_header_for_ua(ua):
     # See https://developer.mozilla.org/en-US/docs/Web/HTTP/Content_negotiation/List_of_default_Accept_values
     if 'Firefox/' in ua: