diff --git a/controllers/scriptStorage.js b/controllers/scriptStorage.js
index 29b860051..0ddb756a4 100644
--- a/controllers/scriptStorage.js
+++ b/controllers/scriptStorage.js
@@ -1831,6 +1831,40 @@ exports.storeScript = function (aUser, aMeta, aBuf, aUpdate, aCallback) {
 
       aInnerCallback(null);
     },
+    function (aInnerCallback) {
+      // `@connect` validations
+      hasInvalidKey = scriptStorageLib.invalidKey(
+        userName,
+          scriptName,
+            isLib,
+              'connect',
+                findMeta(aMeta, 'UserScript.connect.value')
+      );
+
+      if (hasInvalidKey) {
+        aInnerCallback(hasInvalidKey, null);
+        return;
+      }
+
+      aInnerCallback(null);
+    },
+    function (aInnerCallback) {
+      // `@antifeature` validations
+      hasInvalidKey = scriptStorageLib.invalidKey(
+        userName,
+          scriptName,
+            isLib,
+              'antifeature',
+                findMeta(aMeta, 'UserScript.antifeature.value1')
+      );
+
+      if (hasInvalidKey) {
+        aInnerCallback(hasInvalidKey, null);
+        return;
+      }
+
+      aInnerCallback(null);
+    },
     function (aInnerCallback) {
       // `@noframes` validations
       hasInvalidKey = scriptStorageLib.invalidKey(
diff --git a/libs/scriptStorage.js b/libs/scriptStorage.js
index 24b12dfd7..91264a49a 100644
--- a/libs/scriptStorage.js
+++ b/libs/scriptStorage.js
@@ -57,6 +57,47 @@ function invalidKey(aAuthorName, aScriptName, aIsLib, aKeyName, aKeyValue) {  //
         }
       }
       break;
+    case 'antifeature':
+      if (aKeyValue) {
+        aKeyValue.forEach(function (aElement, aIndex, aArray) {
+          switch (aElement) {
+            case 'ads':
+            case 'membership':
+            case 'miner':
+            case 'referral-link':
+            case 'tracking':
+              // fallsthrough
+              break;
+            default:
+              hasInvalidKeys.push(
+                new statusError({
+                  message: '`@' + aKeyName +
+                    '` with value of `' + aElement + '` is not valid or supported.',
+                  code: 400 // Bad request
+                })
+              );
+          }
+        });
+
+        if (hasInvalidKeys.length > 0) {
+          // NOTE: return only first error since header limitations may throw if RFC2047'd
+          // TODO: May expand this later
+          return hasInvalidKeys[0];
+        }
+
+      }
+      break;
+    case 'connect':
+      if (aIsLib) {
+        if (aKeyValue) {
+          return new statusError({
+            message: '`@' + aKeyName +
+              '` not valid in a Library.',
+            code: 400 // Bad request
+          });
+        }
+      }
+      break;
     case 'downloadURL':
       if (aIsLib) {
         if (aKeyValue) {
diff --git a/public/pegjs/blockUserScript.pegjs b/public/pegjs/blockUserScript.pegjs
index d6e81e94e..d629e008f 100644
--- a/public/pegjs/blockUserScript.pegjs
+++ b/public/pegjs/blockUserScript.pegjs
@@ -22,6 +22,7 @@ Test the generated parser with some input for peg.js site at https://pegjs.org/o
 // @noframes
 // @grant     GM_log
 // @grant     none
+// @connect      example.com
 // @homepageURL  http://example.com/foo/atHomepageURL1
 // @homepage     http://example.com/foo/atHomepage2
 // @website      http://example.com/foo/atSite3
@@ -45,10 +46,25 @@ Test the generated parser with some input for peg.js site at https://pegjs.org/o
 // @exclude   http://example.com/foo
 // @exclude   http://example.org/foo
 // @contributionURL https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=your.email@example.org&item_name=OpenUserJS+Author+Donation
+// @antifeature ads
+// @antifeature ads This script contains too many ads.
+// @antifeature:ru ads Этот скрипт содержит рекламу.
+// @antifeature membership
+// @antifeature membership This script requires an account for full functionality.
+// @antifeature miner
+// @antifeature miner This script uses a lot of electricity on your behalf.
+// @antifeature referral-link
+// @antifeature referral-link This script makes money for the Author.
+// @antifeature tracking
+// @antifeature tracking This script contains a tracking of your activity.
 // ==/UserScript==
 
 */
 
+/*
+ * // @antifeature payment should not be supported in FOSS
+ */
+
 {
   var upmix = function (aKeyword) {
     // Keywords need to mirrored in the below rules for detection and transformation
@@ -68,6 +84,8 @@ Test the generated parser with some input for peg.js site at https://pegjs.org/o
       case 'installURL':
         aKeyword = 'downloadURL';
         break;
+      case 'domain':
+        aKeyword = 'connect';
     }
 
     return aKeyword;
@@ -91,7 +109,8 @@ line =
       item1Localized /
 
       items1 /
-      items2
+      items2 /
+      itemz2Localized
     )
   '\n'?
   {
@@ -186,6 +205,7 @@ items1 =
       'homepageURL' /
       'homepage' /
       'grant' /
+      'connect' /
       'exclude' /
       'copyright'
     )
@@ -218,3 +238,43 @@ items2 =
       value2: value2trimmed
     };
   }
+
+itemz2Localized =
+  keyword:
+    (
+      'antifeature'
+    )
+  locale: (':' localeValue:$[a-zA-Z-]+ {
+    return localeValue;
+  })?
+  whitespace
+  value1: non_whitespace
+  whitespace?
+  value2: non_newline?
+  {
+    var keywordUpmixed = upmix(keyword);
+    var value2trimmed = null;
+
+    if (value2) {
+      value2trimmed = value2.trim();
+    }
+
+    var obj = {
+      key: keywordUpmixed,
+      value: (value1 + (value2trimmed ? '\u0020' + value2trimmed : '')),
+
+      value1: value1
+    }
+
+    if (value2trimmed) {
+      obj.value2 = value2trimmed;
+    }
+
+    if (locale) {
+      obj.key += ':' + locale;
+      obj.keyword = keywordUpmixed;
+      obj.locale = locale;
+    }
+
+    return obj;
+  }