diff --git a/yt_dlp/cookies.py b/yt_dlp/cookies.py
index 459a4b7de0..b72aa3f348 100644
--- a/yt_dlp/cookies.py
+++ b/yt_dlp/cookies.py
@@ -125,6 +125,8 @@ def extract_cookies_from_browser(browser_name, profile=None, logger=YDLLogger(),
 
 
 def _extract_firefox_cookies(profile, container, logger):
+    MAX_SUPPORTED_DB_SCHEMA_VERSION = 16
+
     logger.info('Extracting cookies from firefox')
     if not sqlite3:
         logger.warning('Cannot extract cookies from firefox without sqlite3 support. '
@@ -159,9 +161,12 @@ def _extract_firefox_cookies(profile, container, logger):
             raise ValueError(f'could not find firefox container "{container}" in containers.json')
 
     with tempfile.TemporaryDirectory(prefix='yt_dlp') as tmpdir:
-        cursor = None
-        try:
+        cursor = _open_database_copy(cookie_database_path, tmpdir)
+        with contextlib.closing(cursor.connection):
             cursor = _open_database_copy(cookie_database_path, tmpdir)
+            db_schema_version = cursor.execute('PRAGMA user_version;').fetchone()[0]
+            if db_schema_version > MAX_SUPPORTED_DB_SCHEMA_VERSION:
+                logger.warning(f'Possibly unsupported firefox cookies database version: {db_schema_version}')
             if isinstance(container_id, int):
                 logger.debug(
                     f'Only loading cookies from firefox container "{container}", ID {container_id}')
@@ -180,6 +185,10 @@ def _extract_firefox_cookies(profile, container, logger):
                 total_cookie_count = len(table)
                 for i, (host, name, value, path, expiry, is_secure) in enumerate(table):
                     progress_bar.print(f'Loading cookie {i: 6d}/{total_cookie_count: 6d}')
+                    # FF142 upgraded cookies DB to schema version 16 and started using milliseconds for cookie expiry
+                    # Ref: https://github.com/mozilla-firefox/firefox/commit/5869af852cd20425165837f6c2d9971f3efba83d
+                    if db_schema_version >= 16 and expiry is not None:
+                        expiry /= 1000
                     cookie = http.cookiejar.Cookie(
                         version=0, name=name, value=value, port=None, port_specified=False,
                         domain=host, domain_specified=bool(host), domain_initial_dot=host.startswith('.'),
@@ -188,9 +197,6 @@ def _extract_firefox_cookies(profile, container, logger):
                     jar.set_cookie(cookie)
             logger.info(f'Extracted {len(jar)} cookies from firefox')
             return jar
-        finally:
-            if cursor is not None:
-                cursor.connection.close()
 
 
 def _firefox_browser_dirs():