As Google fully removes support for Manifest V2 extensions, plugins like uBlock Origin face limited functionality in Chrome. While AdGuard offers alternatives, users are more concerned about browser performance and compatibility. Firefox and Brave have emerged as primary choices: Firefox leverages its proprietary Gecko engine to fully retain uBlock Origin's underlying blocking capabilities, ensuring uninterrupted ad filtering. Brave, on the other hand, hosts Manifest V2 plugins on its own servers, allowing users to manually enable full-featured ad-blocking tools while maintaining a dedicated extension repository. In terms of performance, Chrome leads with a score of 52.3 in the Speedometer 3.0 test, but Brave achieves a close 48.4 through underlying optimizations, nearing native Chrome levels. Firefox, hindered by engine generational gaps, scores 36.2 but mitigates single-tab crashes via process isolation and reduces memory usage by 25% compared to Chrome. Regarding resource consumption, Brave's memory drops to 112MB after closing all tabs, outperforming Chrome's 500MB residual usage. Firefox's Zen branch, built on the Gecko engine, starts in just 0.6-0.7 seconds and consumes 50% less memory than Chrome. In the extension ecosystem, Firefox supports both Manifest V2/V3, ensuring seamless operation of plugins like uBlock Origin. Brave, compatible with the Chromium ecosystem, delivers extension API response latencies averaging 28ms, outperforming Firefox's 41ms. Overall, Brave strikes a balance between performance and compatibility, while Firefox excels in privacy protection and extension freedom, allowing users to choose based on their needs.