diff --git a/src/features/html_based.py b/src/features/html_based.py
index 31ace65..d6ba668 100644
--- a/src/features/html_based.py
+++ b/src/features/html_based.py
@@ -20,7 +20,6 @@ class Advertisement(MetadataBase):
         "https://easylist.to/easylist/easylist_thirdparty.txt",
         "https://easylist.to/easylist/easylist_thirdparty_popup.txt",
     ]
-    key: str = "ads"
 
 
 class EasyPrivacy(MetadataBase):
@@ -36,7 +35,6 @@ class EasyPrivacy(MetadataBase):
         "https://github.com/easylist/easylist/blob/master/easyprivacy/easyprivacy_thirdparty.txt",
         "https://github.com/easylist/easylist/blob/master/easyprivacy/easyprivacy_thirdparty_international.txt",
     ]
-    key = "easyprivacy"
 
 
 class IETracker(MetadataBase):
@@ -58,7 +56,6 @@ class Cookies(MetadataBase):
         "https://github.com/easylist/easylist/blob/master/easylist_cookie/easylist_cookie_specific_hide.txt",
         "https://github.com/easylist/easylist/blob/master/easylist_cookie/easylist_cookie_thirdparty.txt",
     ]
-    key: str = "cookies"
 
 
 class FanboyAnnoyance(MetadataBase):
@@ -72,7 +69,6 @@ class FanboyAnnoyance(MetadataBase):
         "https://easylist.to/easylist/fanboy_annoyance_specific_block.txt",
         "https://easylist.to/easylist/fanboy_annoyance_thirdparty.txt",
     ]
-    key: str = "fanboy_annoyance"
 
 
 class FanboyNotification(MetadataBase):
@@ -85,7 +81,6 @@ class FanboyNotification(MetadataBase):
         "https://easylist.to/easylist/fanboy_notifications_specific_hide.txt",
         "https://easylist.to/easylist/fanboy_notifications_thirdparty.txt",
     ]
-    key: str = "fanboy_notification"
 
 
 class FanboySocialMedia(MetadataBase):
@@ -100,26 +95,17 @@ class FanboySocialMedia(MetadataBase):
         "https://easylist.to/easylist/fanboy_social_specific_hide.txt",
         "https://easylist.to/easylist/fanboy_social_thirdparty.txt",
     ]
-    key: str = "fanboy_social"
 
 
 class AntiAdBlock(MetadataBase):
-    url: str = (
-        "https://easylist-downloads.adblockplus.org/antiadblockfilters.txt"
-    )
+    urls: list = [
+        "https://easylist-downloads.adblockplus.org/antiadblockfilters.txt",
+        "https://github.com/easylist/antiadblockfilters/blob/master/antiadblockfilters/antiadblock_german.txt",
+        "https://github.com/easylist/antiadblockfilters/blob/master/antiadblockfilters/antiadblock_english.txt",
+    ]
     key: str = "anti_adblock"
 
 
-class AntiAdBlockGerman(MetadataBase):
-    url: str = "https://github.com/easylist/antiadblockfilters/blob/master/antiadblockfilters/antiadblock_german.txt"
-    key: str = "antiadblock_german"
-
-
-class AntiAdBlockEnglish(MetadataBase):
-    url: str = "https://github.com/easylist/antiadblockfilters/blob/master/antiadblockfilters/antiadblock_english.txt"
-    key: str = "antiadblock_english"
-
-
 class EasylistGermany(MetadataBase):
     urls: list = [
         "https://easylist.to/easylistgermany/easylistgermany.txt",
@@ -138,7 +124,6 @@ class EasylistGermany(MetadataBase):
         "https://github.com/easylist/easylistgermany/blob/master/easylistgermany/easylistgermany_thirdparty.txt",
         "https://github.com/easylist/easylistgermany/blob/master/easylistgermany/easylistgermany_thirdparty_popup.txt",
     ]
-    key: str = "easylist_germany"
 
 
 class EasylistAdult(MetadataBase):
@@ -153,7 +138,6 @@ class EasylistAdult(MetadataBase):
         "https://github.com/easylist/easylist/blob/master/easylist_adult/adult_thirdparty.txt",
         "https://github.com/easylist/easylist/blob/master/easylist_adult/adult_thirdparty_popup.txt",
     ]
-    key: str = "easylist_adult"
 
 
 class Paywalls(MetadataBase):
@@ -163,7 +147,6 @@ class Paywalls(MetadataBase):
 
 class ContentSecurityPolicy(MetadataBase):
     tag_list = ["Content-Security-Policy"]
-    key: str = "content_security_policy"
     evaluate_header = True
 
 
@@ -183,4 +166,3 @@ class PopUp(MetadataBase):
         "interstitial",
         "Interstitial",
     ]
-    key = "popup"
diff --git a/src/features/metadata_base.py b/src/features/metadata_base.py
index 7e0264b..39c2aa4 100644
--- a/src/features/metadata_base.py
+++ b/src/features/metadata_base.py
@@ -21,6 +21,11 @@ class MetadataBase:
     def __init__(self, logger) -> None:
         self._logger = logger
 
+        if self.key == "":
+            self.key = re.sub(
+                r"(?<!^)(?=[A-Z])", "_", self.__class__.__name__
+            ).lower()
+
     def start(self, html_content: str = "", header=None) -> dict:
         if header is None:
             header = {}
diff --git a/src/manager.py b/src/manager.py
index 2f30ce1..635f1d3 100644
--- a/src/manager.py
+++ b/src/manager.py
@@ -14,8 +14,6 @@
 from features.html_based import (
     Advertisement,
     AntiAdBlock,
-    AntiAdBlockEnglish,
-    AntiAdBlockGerman,
     ContentSecurityPolicy,
     Cookies,
     EasylistAdult,
@@ -79,8 +77,6 @@ def _create_extractors(self):
             FanboyNotification,
             FanboySocialMedia,
             AntiAdBlock,
-            AntiAdBlockGerman,
-            AntiAdBlockEnglish,
             EasylistGermany,
             EasylistAdult,
             Paywalls,
diff --git a/tests/unit/manager_test.py b/tests/unit/manager_test.py
index cc99be8..6ebeed5 100644
--- a/tests/unit/manager_test.py
+++ b/tests/unit/manager_test.py
@@ -27,7 +27,7 @@ def test_init(manager: Manager, mocker):
     assert manager._create_logger.call_count == 1
     assert manager._create_api.call_count == 1
     assert run_spy.call_count == 0
-    assert len(manager.metadata_extractors) == 17
+    assert len(manager.metadata_extractors) == 15
     assert manager.run_loop
 
 
diff --git a/tests/unit/metadatabase_test.py b/tests/unit/metadatabase_test.py
index 235b79c..1bb4b18 100644
--- a/tests/unit/metadatabase_test.py
+++ b/tests/unit/metadatabase_test.py
@@ -19,7 +19,7 @@ def test_init(metadatabase: MetadataBase, mocker):
     assert metadatabase.tag_list == []
     assert metadatabase.tag_list_last_modified == ""
     assert metadatabase.tag_list_expires == 0
-    assert metadatabase.key == ""
+    assert metadatabase.key == "metadata_base"
     assert metadatabase.url == ""
     assert metadatabase.comment_symbol == ""
     assert not metadatabase.evaluate_header