diff --git a/src/main/cdp/execution-context.ts b/src/main/cdp/execution-context.ts
index 9b8bf16..db01a16 100644
--- a/src/main/cdp/execution-context.ts
+++ b/src/main/cdp/execution-context.ts
@@ -203,17 +203,18 @@ export class ExecutionContext {
         throw err;
     }
 
-    initContentScripts(scripts: ContentScript[]) {
+    async initContentScripts(scripts: ContentScript[]) {
         const options = {
             toolkitBinding: this.page.toolkitBinding,
         };
-        for (const { fn, filename } of scripts) {
+        const promises = scripts.map(async ({ fn, filename }) => {
             const source = `(${fn.toString()})(${JSON.stringify(options)})\n//# sourceURL=${filename}\n`;
-            this.page.sendAndForget('Runtime.evaluate', {
+            await this.page.send('Runtime.evaluate', {
                 contextId: this.executionContextId,
                 expression: source,
             });
-        }
+        });
+        await Promise.allSettled(promises);
     }
 
     protected onExecutionContextsCleared() {
diff --git a/src/main/cdp/frame.ts b/src/main/cdp/frame.ts
index d32cbc9..5892e39 100644
--- a/src/main/cdp/frame.ts
+++ b/src/main/cdp/frame.ts
@@ -60,7 +60,7 @@ export class Frame extends EventEmitter {
             grantUniveralAccess: true,
         });
         this._isolatedWorld = new ExecutionContext(this, executionContextId);
-        this._isolatedWorld.initContentScripts(runtimeScripts);
+        await this._isolatedWorld.initContentScripts(runtimeScripts);
         return this._isolatedWorld;
     }
 
diff --git a/src/main/cdp/target.ts b/src/main/cdp/target.ts
index 5f8dded..ed416f5 100644
--- a/src/main/cdp/target.ts
+++ b/src/main/cdp/target.ts
@@ -2,7 +2,7 @@ import { EventEmitter } from 'events';
 
 import { Exception } from '../exception.js';
 import { Browser } from './browser.js';
-import { runtimeScripts, stubScripts } from './inject/index.js';
+import { stubScripts } from './inject/index.js';
 import { InterceptedRequest } from './interceptor.js';
 import { Page, PageNavigateOptions, PageWaitOptions } from './page.js';
 import { CdpFrame, CdpLifecycleEvent, CdpLoadingFailed, CdpRequestPaused, CdpRequestWillBeSent, CdpResponse, CdpResponseReceived, CdpTargetInfo, CdpTargetType } from './types.js';
@@ -382,12 +382,5 @@ export class Target extends EventEmitter {
                 source: `(${fn.toString()})()`
             });
         });
-        runtimeScripts.forEach(({ fn, filename }) => {
-            const options = {
-                toolkitBinding: this.browser.config.toolkitBinding,
-            };
-            const source = `(${fn.toString()})(${JSON.stringify(options)})\n//# sourceURL=${filename}\n`;
-            this.sendAndForget('Page.addScriptToEvaluateOnNewDocument', { source });
-        });
     }
 }