diff --git a/src/app/service/service_worker/dnr.ts b/src/app/service/service_worker/dnr.ts
new file mode 100644
index 000000000..a312b8c3b
--- /dev/null
+++ b/src/app/service/service_worker/dnr.ts
@@ -0,0 +1,49 @@
+/**
+ * scheduler 用于 Service Worker 或 Event Page, Chrome 94+, Firefox 142+
+ */
+const scheduler_ =
+  typeof scheduler !== "undefined" &&
+  typeof scheduler?.postTask === "function" &&
+  typeof scheduler?.yield === "function"
+    ? scheduler
+    : null;
+
+// 用于扩充初始化时新增 SessionRules. FireFox 需要等一等才加，否则会失效。
+export const addSessionRules = async (rules: chrome.declarativeNetRequest.Rule[]) => {
+  await scheduler_?.yield?.();
+  try {
+    await chrome.declarativeNetRequest.updateSessionRules({
+      removeRuleIds: [...rules.map((rule) => rule.id)],
+      addRules: rules,
+    });
+    return true;
+  } catch (e) {
+    console.error("chrome.declarativeNetRequest.updateSessionRules:", e);
+    return e;
+  }
+};
+
+export const sessionRuleDynamicAdd = async (rule: chrome.declarativeNetRequest.Rule): Promise<any> => {
+  try {
+    await chrome.declarativeNetRequest.updateSessionRules({
+      removeRuleIds: [rule.id],
+      addRules: [rule],
+    });
+    return true;
+  } catch (e) {
+    console.error("chrome.declarativeNetRequest.updateSessionRules:", e);
+    return e;
+  }
+};
+
+export const sessionRuleDynamicRemove = async (ruleId: number): Promise<any> => {
+  try {
+    await chrome.declarativeNetRequest.updateSessionRules({
+      removeRuleIds: [ruleId],
+    });
+    return true;
+  } catch (e) {
+    console.error("chrome.declarativeNetRequest.updateSessionRules:", e);
+    return e;
+  }
+};
diff --git a/src/app/service/service_worker/gm_api/gm_api.ts b/src/app/service/service_worker/gm_api/gm_api.ts
index 5d1bf7033..a5b0f3ca7 100644
--- a/src/app/service/service_worker/gm_api/gm_api.ts
+++ b/src/app/service/service_worker/gm_api/gm_api.ts
@@ -55,6 +55,7 @@ import { BgGMXhr } from "@App/pkg/utils/xhr/bg_gm_xhr";
 import { mightPrepareSetClipboard, setClipboard } from "../clipboard";
 import { nativePageWindowOpen } from "../../offscreen/gm_api";
 import { nextSessionRuleId, removeSessionRuleIdEntry } from "./dnr_id_controller";
+import { addSessionRules, sessionRuleDynamicAdd, sessionRuleDynamicRemove } from "../dnr";
 
 let generatedUniqueMarkerIDs = "";
 let generatedUniqueMarkerIDWhen = "";
@@ -87,20 +88,11 @@ const headersSettled = (markerID: string) => {
     headerModifierMap.delete(markerID);
   }
   if (ruleID) {
-    chrome.declarativeNetRequest.updateSessionRules(
-      {
-        removeRuleIds: [ruleID],
-      },
-      () => {
-        const lastError = chrome.runtime.lastError;
-        if (lastError) {
-          // removeRuleIds 失败: 浏览器里仍保留该规则，本地不释放 ruleID 避免复用
-          console.error("chrome.declarativeNetRequest.updateSessionRules:", lastError);
-          return;
-        }
-        removeSessionRuleIdEntry(ruleID);
-      }
-    );
+    sessionRuleDynamicRemove(ruleID).then((removeResult) => {
+      // removeRuleIds 失败: 浏览器里仍保留该规则，本地不释放 ruleID 避免复用
+      if (removeResult !== true) return;
+      removeSessionRuleIdEntry(ruleID);
+    });
   }
 };
 
@@ -749,16 +741,12 @@ export default class GMApi {
         },
       } as chrome.declarativeNetRequest.Rule;
       headerModifierMap.set(markerID, { rule, redirectNotManual });
-      try {
-        await chrome.declarativeNetRequest.updateSessionRules({
-          removeRuleIds: [ruleId],
-          addRules: [rule],
-        });
-      } catch (e) {
+      const addResult = await sessionRuleDynamicAdd(rule);
+      if (addResult !== true) {
         // addRules 失败: 回滚本地 headerModifierMap 关联并释放 ruleId，避免永久占位导致限额锁死
         headerModifierMap.delete(markerID);
         removeSessionRuleIdEntry(ruleId);
-        throw e;
+        throw addResult;
       }
     }
     return true;
@@ -1648,18 +1636,7 @@ export default class GMApi {
                 },
               };
               headerModifierMap.set(markerID, { rule: newRule, redirectNotManual });
-              chrome.declarativeNetRequest.updateSessionRules(
-                {
-                  removeRuleIds: [rule.id],
-                  addRules: [newRule],
-                },
-                () => {
-                  const lastError = chrome.runtime.lastError;
-                  if (lastError) {
-                    console.error("chrome.declarativeNetRequest.updateSessionRules:", lastError);
-                  }
-                }
-              );
+              sessionRuleDynamicAdd(newRule);
               return;
             }
           }
@@ -1723,18 +1700,7 @@ export default class GMApi {
         tabIds: [chrome.tabs.TAB_ID_NONE], // 只限于后台 service_worker / offscreen
       },
     } as chrome.declarativeNetRequest.Rule;
-    chrome.declarativeNetRequest.updateSessionRules(
-      {
-        removeRuleIds: [ruleId],
-        addRules: [rule],
-      },
-      () => {
-        const lastError = chrome.runtime.lastError;
-        if (lastError) {
-          console.error("chrome.declarativeNetRequest.updateSessionRules:", lastError);
-        }
-      }
-    );
+    addSessionRules([rule]);
   }
 
   start() {
diff --git a/src/app/service/service_worker/script.ts b/src/app/service/service_worker/script.ts
index f2594f8a0..156c9f93c 100644
--- a/src/app/service/service_worker/script.ts
+++ b/src/app/service/service_worker/script.ts
@@ -47,6 +47,7 @@ import { getSimilarityScore, ScriptUpdateCheck } from "./script_update_check";
 import { LocalStorageDAO } from "@App/app/repo/localStorage";
 import { CompiledResourceDAO } from "@App/app/repo/resource";
 import { initRegularUpdateCheck } from "./regular_updatecheck";
+import { addSessionRules } from "./dnr";
 
 export type TCheckScriptUpdateOption = Partial<
   { checkType: "user"; noUpdateCheck?: number } | ({ checkType: "system" } & Record<string, any>)
@@ -299,20 +300,7 @@ export class ScriptService {
         }
       }
     );
-    chrome.declarativeNetRequest.updateSessionRules(
-      {
-        removeRuleIds: [...rules.map((rule) => rule.id)],
-        addRules: rules,
-      },
-      () => {
-        if (chrome.runtime.lastError) {
-          console.error(
-            "chrome.runtime.lastError in chrome.declarativeNetRequest.updateSessionRules:",
-            chrome.runtime.lastError
-          );
-        }
-      }
-    );
+    addSessionRules(rules);
   }
 
   public async openInstallPageByUrl(
diff --git a/src/types/main.d.ts b/src/types/main.d.ts
index 0b9624821..a50ba249d 100644
--- a/src/types/main.d.ts
+++ b/src/types/main.d.ts
@@ -7,6 +7,20 @@ declare module "@App/app/types.d.ts";
 type Override<T, U> = Omit<T, keyof U> & U;
 type ValueOf<T> = T[keyof T];
 type ReactStateSetter<T> = (value: T | ((prev: T) => T)) => void;
+type ResolveFn<T = void> = (val: T) => void;
+
+interface SchedulerPostTaskOptions {
+  delay?: number;
+  priority?: "user-blocking" | "user-visible" | "background";
+  signal?: AbortSignal;
+}
+
+interface Scheduler {
+  postTask<T>(callback: () => T | Promise<T>, options?: SchedulerPostTaskOptions): Promise<T>;
+  yield(): Promise<void>;
+}
+
+declare let scheduler: Scheduler | undefined;
 
 declare const sandbox: Window;