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diff --git a/toolkit/modules/sessionstore/PrivacyLevel.sys.mjs b/toolkit/modules/sessionstore/PrivacyLevel.sys.mjs
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+++ b/toolkit/modules/sessionstore/PrivacyLevel.sys.mjs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
+
+// The following constants represent the different possible privacy levels that
+// can be set by the user and that we need to consider when collecting text
+// data, and cookies.
+//
+// Collect data from all sites (http and https).
+const PRIVACY_NONE = 0;
+// Collect data from unencrypted sites (http), only.
+const PRIVACY_ENCRYPTED = 1;
+// Collect no data.
+const PRIVACY_FULL = 2;
+
+export var PrivacyLevel = {
+  /**
+   * Returns whether the current privacy level allows saving data for the given
+   * |url|.
+   *
+   * @param url The URL we want to save data for.
+   * @return bool
+   */
+  check(url) {
+    return PrivacyLevel.canSave(url.startsWith("https:"));
+  },
+
+  /**
+   * Checks whether we're allowed to save data for a specific site.
+   *
+   * @param isHttps A boolean that tells whether the site uses TLS.
+   * @return {bool} Whether we can save data for the specified site.
+   */
+  canSave(isHttps) {
+    // Never save any data when full privacy is requested.
+    if (this.privacyLevel == PRIVACY_FULL) {
+      return false;
+    }
+
+    // Don't save data for encrypted sites when requested.
+    if (isHttps && this.privacyLevel == PRIVACY_ENCRYPTED) {
+      return false;
+    }
+
+    return true;
+  },
+
+  canSaveAnything() {
+    return this.privacyLevel != PRIVACY_FULL;
+  },
+
+  shouldSaveEverything() {
+    return this.privacyLevel == PRIVACY_NONE;
+  },
+};
+
+XPCOMUtils.defineLazyPreferenceGetter(
+  PrivacyLevel,
+  "privacyLevel",
+  "browser.sessionstore.privacy_level"
+);