The Impact of Google’s Manifest Version 3 Update on Ad Blocker Effectiveness

谷歌 Manifest V3 更新对广告拦截器有效性的影响

Abstract: Google’s recent update to the manifest file for Chrome browser extensions, transitioning from manifest version 2 (MV2) to manifest version 3 (MV3), has raised concerns among users and ad blocker providers, who worry that the new restrictions, notably the shift from the powerful WebRequest API to the more restrictive DeclarativeNetRequest API, might reduce ad blocker effectiveness.

摘要： 谷歌近期对其 Chrome 浏览器扩展程序的清单文件（manifest file）进行了更新，从清单版本 2 (MV2) 过渡到清单版本 3 (MV3)。此举引发了用户和广告拦截服务提供商的担忧，他们担心新的限制——特别是从功能强大的 WebRequest API 转向限制性更强的 DeclarativeNetRequest API——可能会降低广告拦截器的有效性。

Because ad blockers play a vital role for millions of users seeking a more private and ad-free browsing experience, this study empirically investigates how the MV3 update affects their ability to block ads and trackers.

由于广告拦截器对于数百万追求更私密、无广告浏览体验的用户来说至关重要，本研究通过实证调查了 MV3 更新如何影响其拦截广告和追踪器的能力。

Through a browser-based experiment conducted across multiple samples of ad-supported websites, we compare the MV3 to MV2 instances of four widely used ad blockers.

通过在多个广告支持的网站样本上进行的浏览器实验，我们对比了四款广泛使用的广告拦截器的 MV3 版本与 MV2 版本。

Our results reveal no statistically significant reduction in ad-blocking or anti-tracking effectiveness for MV3 ad blockers compared to their MV2 counterparts, and in some cases, MV3 instances even exhibit slight improvements in blocking trackers.

研究结果显示，与 MV2 版本相比，MV3 广告拦截器在广告拦截或反追踪有效性方面没有出现统计学意义上的显著下降；在某些情况下，MV3 版本在拦截追踪器方面甚至表现出轻微的改进。

These findings are reassuring for users, indicating that the MV3 instances of popular ad blockers continue to provide effective protection against intrusive ads and privacy-infringing trackers.

这些发现让用户感到安心，表明主流广告拦截器的 MV3 版本能够继续为用户提供有效的保护，抵御侵入式广告和侵犯隐私的追踪器。

While some uncertainties remain, ad blocker providers appear to have successfully navigated the MV3 update, finding solutions that maintain the core functionality of their extensions.

尽管仍存在一些不确定性，但广告拦截服务提供商似乎已成功应对了 MV3 更新，并找到了能够维持其扩展程序核心功能的解决方案。