1 files changed, 85 insertions, 44 deletions
diff --git a/toolkit/components/extensions/ExtensionDNRLimits.sys.mjs b/toolkit/components/extensions/ExtensionDNRLimits.sys.mjs
index ac4cd79c44..12919e4ee1 100644
--- a/toolkit/components/extensions/ExtensionDNRLimits.sys.mjs
+++ b/toolkit/components/extensions/ExtensionDNRLimits.sys.mjs
@@ -2,58 +2,99 @@
  * 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/. */
 
-// TODO(Bug 1803370): consider allowing changing DNR limits through about:config prefs).
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
 
-/**
- * The minimum number of static rules guaranteed to an extension across its
- * enabled static rulesets. Any rules above this limit will count towards the
- * global static rule limit.
- */
-const GUARANTEED_MINIMUM_STATIC_RULES = 30000;
+// TODO(Bug 1803370): allow extension to exceed the GUARANTEED_MINIMUM_STATIC_RULES limit.
+//
+// The maximum number of static rules exceeding the per-extension
+// GUARANTEED_MINIMUM_STATIC_RULES across every extensions.
+//
+// const MAX_GLOBAL_NUMBER_OF_STATIC_RULES = 300000;
 
-/**
- * The maximum number of static Rulesets an extension can specify as part of
- * the "rule_resources" manifest key.
- *
- * NOTE: this limit may be increased in the future, see https://github.com/w3c/webextensions/issues/318
- */
-const MAX_NUMBER_OF_STATIC_RULESETS = 50;
+const lazy = {};
 
-/**
- * The maximum number of static Rulesets an extension can enable at any one time.
- *
- * NOTE: this limit may be increased in the future, see https://github.com/w3c/webextensions/issues/318
- */
-const MAX_NUMBER_OF_ENABLED_STATIC_RULESETS = 10;
+XPCOMUtils.defineLazyPreferenceGetter(
+  lazy,
+  "GUARANTEED_MINIMUM_STATIC_RULES",
+  "extensions.dnr.guaranteed_minimum_static_rules",
+  30000
+);
 
-/**
- * The maximum number of dynamic and session rules an extension can add.
- * NOTE: in the Firefox we are enforcing this limit to the session and dynamic rules count separately,
- * instead of enforcing it to the rules count for both combined as the Chrome implementation does.
- *
- * NOTE: this limit may be increased in the future, see https://github.com/w3c/webextensions/issues/319
- */
-const MAX_NUMBER_OF_DYNAMIC_AND_SESSION_RULES = 5000;
+XPCOMUtils.defineLazyPreferenceGetter(
+  lazy,
+  "MAX_NUMBER_OF_STATIC_RULESETS",
+  "extensions.dnr.max_number_of_static_rulesets",
+  100
+);
+
+XPCOMUtils.defineLazyPreferenceGetter(
+  lazy,
+  "MAX_NUMBER_OF_ENABLED_STATIC_RULESETS",
+  "extensions.dnr.max_number_of_enabled_static_rulesets",
+  20
+);
 
 /**
- * The maximum number of regular expression rules that an extension can add.
- * Session, dynamic and static rules have their own quota.
- *
- * TODO bug 1821033: Bump limit after optimizing regexFilter.
+ * NOTE: this limit may be increased in the future, see
+ * https://github.com/w3c/webextensions/issues/319
  */
-const MAX_NUMBER_OF_REGEX_RULES = 1000;
+XPCOMUtils.defineLazyPreferenceGetter(
+  lazy,
+  "MAX_NUMBER_OF_DYNAMIC_AND_SESSION_RULES",
+  "extensions.dnr.max_number_of_dynamic_and_session_rules",
+  5000
+);
 
-// TODO(Bug 1803370): allow extension to exceed the GUARANTEED_MINIMUM_STATIC_RULES limit.
-//
-// The maximum number of static rules exceeding the per-extension
-// GUARANTEED_MINIMUM_STATIC_RULES across every extensions.
-//
-// const MAX_GLOBAL_NUMBER_OF_STATIC_RULES = 300000;
+// TODO bug 1821033: Bump limit after optimizing regexFilter.
+XPCOMUtils.defineLazyPreferenceGetter(
+  lazy,
+  "MAX_NUMBER_OF_REGEX_RULES",
+  "extensions.dnr.max_number_of_regex_rules",
+  1000
+);
 
 export const ExtensionDNRLimits = {
-  GUARANTEED_MINIMUM_STATIC_RULES,
-  MAX_NUMBER_OF_STATIC_RULESETS,
-  MAX_NUMBER_OF_ENABLED_STATIC_RULESETS,
-  MAX_NUMBER_OF_DYNAMIC_AND_SESSION_RULES,
-  MAX_NUMBER_OF_REGEX_RULES,
+  /**
+   * The minimum number of static rules guaranteed to an extension across its
+   * enabled static rulesets. Any rules above this limit will count towards the
+   * global static rule limit.
+   */
+  get GUARANTEED_MINIMUM_STATIC_RULES() {
+    return lazy.GUARANTEED_MINIMUM_STATIC_RULES;
+  },
+
+  /**
+   * The maximum number of static Rulesets an extension can specify as part of
+   * the "rule_resources" manifest key.
+   */
+  get MAX_NUMBER_OF_STATIC_RULESETS() {
+    return lazy.MAX_NUMBER_OF_STATIC_RULESETS;
+  },
+
+  /**
+   * The maximum number of static Rulesets an extension can enable at any one
+   * time.
+   */
+  get MAX_NUMBER_OF_ENABLED_STATIC_RULESETS() {
+    return lazy.MAX_NUMBER_OF_ENABLED_STATIC_RULESETS;
+  },
+
+  /**
+   * The maximum number of dynamic and session rules an extension can add.
+   *
+   * NOTE: in the Firefox we are enforcing this limit to the session and
+   * dynamic rules count separately, instead of enforcing it to the rules count
+   * for both combined as the Chrome implementation does.
+   */
+  get MAX_NUMBER_OF_DYNAMIC_AND_SESSION_RULES() {
+    return lazy.MAX_NUMBER_OF_DYNAMIC_AND_SESSION_RULES;
+  },
+
+  /**
+   * The maximum number of regular expression rules that an extension can add.
+   * Session, dynamic and static rules have their own quota.
+   */
+  get MAX_NUMBER_OF_REGEX_RULES() {
+    return lazy.MAX_NUMBER_OF_REGEX_RULES;
+  },
 };