diff --git a/components/brave_extension/extension/brave_extension/assets/removeEmptyElements.css b/components/brave_extension/extension/brave_extension/assets/removeEmptyElements.css
deleted file mode 100644
index 823625d92f36..000000000000
--- a/components/brave_extension/extension/brave_extension/assets/removeEmptyElements.css
+++ /dev/null
@@ -1,27 +0,0 @@
-.ad-hideable,
-  .ad-div,
-  .masthead-ad-control,
-  .video-ads,
-  .promoted-sparkles-text-search-root-container,
-  .ytd-compact-promoted-video-renderer,
-  #ytd-promoted-sparkles-web-renderer,
-  #ytm-promoted-sparkles-text-search-renderer,
-  #pla-shelf,
-  #merch-shelf,
-  #ad_creative_3,
-  #footer-ads,
-  #watch7-sidebar-ads,
-  .ytp-ad-progress-list,
-  .ad-container,
-  #video-masthead,
-  #watch-channel-brand-div,
-  #Billboard-ad {
-    display: none !important;
-}
-
-/* YouTube Masthead and Sidebar Ads */
-#player-ads.ytd-watch,
-ytd-page-manager #masthead-ad.ytd-browse {
-  display: none !important;
-}
-
diff --git a/components/brave_extension/extension/brave_extension/assets/siteHack-coinmarketcap.com.css b/components/brave_extension/extension/brave_extension/assets/siteHack-coinmarketcap.com.css
deleted file mode 100644
index fe92b2bb858e..000000000000
--- a/components/brave_extension/extension/brave_extension/assets/siteHack-coinmarketcap.com.css
+++ /dev/null
@@ -1,5 +0,0 @@
-#icobanner-wrapper,
-.container #leaderboard,
-.container #leaderboard-bottom {
-  display: none !important;
-}
diff --git a/components/brave_extension/extension/brave_extension/assets/siteHack-glennbeck.com.js b/components/brave_extension/extension/brave_extension/assets/siteHack-glennbeck.com.js
deleted file mode 100644
index fc6f41f143cd..000000000000
--- a/components/brave_extension/extension/brave_extension/assets/siteHack-glennbeck.com.js
+++ /dev/null
@@ -1,6 +0,0 @@
-// Site checks indexOf(' gb3...') - Note the leading space.
-// Thus we add it after __a=1
-document.cookie = '__a=1'
-document.cookie = 'gb3lightbox=1'
-document.cookie = 'lightbox_ad=true'
-console.log('we set some cookies!!')
diff --git a/components/brave_extension/extension/brave_extension/assets/siteHack-marketwatch.com.css b/components/brave_extension/extension/brave_extension/assets/siteHack-marketwatch.com.css
deleted file mode 100644
index 03de69bfbe04..000000000000
--- a/components/brave_extension/extension/brave_extension/assets/siteHack-marketwatch.com.css
+++ /dev/null
@@ -1,7 +0,0 @@
-.element--ad,
-.container--bannerAd,
-#brass-rail,
-.ad.module,
-iframe[src*="smartads.epl"] {
-    display: none !important;
-}
\ No newline at end of file
diff --git a/components/brave_extension/extension/brave_extension/manifest.json b/components/brave_extension/extension/brave_extension/manifest.json
index 6ef22c012fb2..3b2ea3aba122 100644
--- a/components/brave_extension/extension/brave_extension/manifest.json
+++ b/components/brave_extension/extension/brave_extension/manifest.json
@@ -52,40 +52,6 @@
       ],
       "run_at": "document_start",
       "all_frames": true
-    }, {
-      "run_at": "document_start",
-      "all_frames": true,
-      "matches": [
-        "https://www.washingtonpost.com/*",
-        "https://www.youtube.com/*",
-        "https://www.yahoo.com/*"
-      ],
-      "css": [
-        "assets/removeEmptyElements.css"
-      ]
-    }, {
-      "run_at": "document_start",
-      "all_frames": true,
-      "matches": [
-        "https://coinmarketcap.com/*"
-      ],
-      "css": [
-        "assets/siteHack-coinmarketcap.com.css"
-      ]
-    }, {
-      "run_at": "document_start",
-      "all_frames": true,
-      "matches": ["https://www.marketwatch.com/*"],
-      "css": [
-        "assets/siteHack-marketwatch.com.css"
-      ]
-    }, {
-      "run_at": "document_start",
-      "all_frames": true,
-      "matches": ["https://www.glennbeck.com/*"],
-      "js": [
-        "assets/siteHack-glennbeck.com.js"
-      ]
     }
   ],
   "permissions": [ "contentSettings", "settingsPrivate", "management", "tabs", "storage", "webNavigation", "contextMenus", "cookies", "*://*/*", "chrome://favicon/*" ],
diff --git a/components/brave_extension/extension/resources.grd b/components/brave_extension/extension/resources.grd
index 6bc03b75e80e..0d7b93d120fd 100644
--- a/components/brave_extension/extension/resources.grd
+++ b/components/brave_extension/extension/resources.grd
@@ -26,9 +26,6 @@
       <include name="IDR_BRAVE_EXTENSION_EN_US_MESSAGES_JSON" file="brave_extension/_locales/en_US/messages.json" type="BINDATA" />
       <include name="IDR_BRAVE_EXTENSION_BRAVE_SHIELDS_HTML" file="brave_extension/braveShieldsPanel.html" type="BINDATA" />
       <include name="IDR_BRAVE_EXTENSION_BRAVELIZER_JS" file="brave_extension/assets/bravelizer.css" type="BINDATA" />
-      <include name="IDR_BRAVE_EXTENSION_REMOVE_EMPTY_ELEMENTS_CSS" file="brave_extension/assets/removeEmptyElements.css" type="BINDATA" />
-      <include name="IDR_BRAVE_EXTENSION_SITEHACKS_MARKETWATCH_CSS" file="brave_extension/assets/siteHack-marketwatch.com.css" type="BINDATA" />
-      <include name="IDR_BRAVE_EXTENSION_SITEHACKS_COINMARKETCAP_CSS" file="brave_extension/assets/siteHack-coinmarketcap.com.css" type="BINDATA" />
       <include name="IDR_BRAVE_EXTENSION_SITEHACKS_GLENNBECK_JS" file="brave_extension/assets/siteHack-glennbeck.com.js" type="BINDATA" />
     </includes>
   </release>