diff --git a/toolkit/components/extensions/ext-privacy.js b/toolkit/components/extensions/ext-privacy.js
index fbbd73415c00..22a495031064 100644
--- a/toolkit/components/extensions/ext-privacy.js
+++ b/toolkit/components/extensions/ext-privacy.js
@@ -138,6 +138,36 @@ ExtensionPreferencesManager.addSetting("websites.referrersEnabled", {
   },
 });
 
+ExtensionPreferencesManager.addSetting("websites.trackingProtectionMode", {
+  prefNames: [
+    "privacy.trackingprotection.enabled",
+    "privacy.trackingprotection.pbmode.enabled",
+  ],
+
+  setCallback(value) {
+    // Default to private browsing.
+    let prefs = {
+      "privacy.trackingprotection.enabled": false,
+      "privacy.trackingprotection.pbmode.enabled": true,
+    };
+
+    switch (value) {
+      case "private_browsing":
+        break;
+
+      case "always":
+        prefs["privacy.trackingprotection.enabled"] = true;
+        break;
+
+      case "never":
+        prefs["privacy.trackingprotection.pbmode.enabled"] = false;
+        break;
+    }
+
+    return prefs;
+  },
+});
+
 this.privacy = class extends ExtensionAPI {
   getAPI(context) {
     let {extension} = context;
@@ -196,6 +226,18 @@ this.privacy = class extends ExtensionAPI {
             () => {
               return Preferences.get("network.http.sendRefererHeader") !== 0;
             }),
+          trackingProtectionMode: getPrivacyAPI(extension,
+            "websites.trackingProtectionMode",
+            () => {
+              if (Preferences.get("privacy.trackingprotection.enabled")) {
+                return "always";
+              } else if (
+                  Preferences.get("privacy.trackingprotection.pbmode.enabled")) {
+                return "private_browsing";
+              }
+              return "never";
+            }),
+
         },
       },
     };
diff --git a/toolkit/components/extensions/schemas/privacy.json b/toolkit/components/extensions/schemas/privacy.json
index d85afc4d7b95..1718727f1182 100644
--- a/toolkit/components/extensions/schemas/privacy.json
+++ b/toolkit/components/extensions/schemas/privacy.json
@@ -63,6 +63,14 @@
     "namespace": "privacy.websites",
     "description": "Use the <code>browser.privacy</code> API to control usage of the features in the browser that can affect a user's privacy.",
     "permissions": ["privacy"],
+    "types": [
+      {
+        "id": "TrackingProtectionModeOption",
+        "type": "string",
+        "enum": ["always", "never", "private_browsing"],
+        "description": "The mode for tracking protection."
+      }
+    ],
     "properties": {
       "thirdPartyCookiesAllowed": {
         "$ref": "types.Setting",
@@ -81,6 +89,10 @@
         "$ref": "types.Setting",
         "description": "<strong>Available on Windows and ChromeOS only</strong>: If enabled, the browser provides a unique ID to plugins in order to run protected content. The value of this preference is of type boolean, and the default value is <code>true</code>.",
         "unsupported": true
+      },
+      "trackingProtectionMode": {
+        "$ref": "types.Setting",
+        "description": "Allow users to specify the mode for tracking protection. This setting's value is of type TrackingProtectionModeOption, defaulting to <code>private_browsing_only</code>."
       }
     }
   }
diff --git a/toolkit/components/extensions/test/xpcshell/test_ext_privacy.js b/toolkit/components/extensions/test/xpcshell/test_ext_privacy.js
index d447846cf2eb..079b53ced5c2 100644
--- a/toolkit/components/extensions/test/xpcshell/test_ext_privacy.js
+++ b/toolkit/components/extensions/test/xpcshell/test_ext_privacy.js
@@ -339,6 +339,19 @@ add_task(async function test_privacy_other_prefs() {
       "network.http.sendRefererHeader": 2,
     });
 
+  await testSetting("websites.trackingProtectionMode", "always", {
+    "privacy.trackingprotection.enabled": true,
+    "privacy.trackingprotection.pbmode.enabled": true,
+  });
+  await testSetting("websites.trackingProtectionMode", "never", {
+    "privacy.trackingprotection.enabled": false,
+    "privacy.trackingprotection.pbmode.enabled": false,
+  });
+  await testSetting("websites.trackingProtectionMode", "private_browsing", {
+    "privacy.trackingprotection.enabled": false,
+    "privacy.trackingprotection.pbmode.enabled": true,
+  });
+
   await testSetting("services.passwordSavingEnabled", false,
     {
       "signon.rememberSignons": false,