https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's tech blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, distributed training, and data engineering. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Sat, 16 May 2026 00:00:00 GMT https://www.youngju.dev/blog/culture/2026-05-16-browser-extension-development-2026-manifest-v3-plasmo-wxt-side-panel-api-deep-dive.en https://www.youngju.dev/blog/culture/2026-05-16-browser-extension-development-2026-manifest-v3-plasmo-wxt-side-panel-api-deep-dive.en Browser extension development became a different world after Chrome permanently killed Manifest V2 in June 2024. Background pages became service workers, blocking webRequest was replaced by declarativeNetRequest, and the Side Panel API and Offscreen Documents API opened new possibilities. This article walks through the 2026 extension stack end to end — modern frameworks like Plasmo and WXT, Firefox MV3 with its caveats, Safari Web Extensions on iOS, Edge Add-ons, AI in extensions, and the Korean/Japanese ecosystems including Kakao, Naver, and Pixiv. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) browser-extensionmanifest-v3mv3plasmowxtvite-web-extensionchrome-extensionsmozilla-webextensionssafari-web-extensionsedge-add-onsside-panel-apideclarativenetrequestservice-worker2026deep-diveenglish https://www.youngju.dev/blog/culture/2026-05-16-browser-extension-development-2026-manifest-v3-plasmo-wxt-side-panel-api-deep-dive.ja https://www.youngju.dev/blog/culture/2026-05-16-browser-extension-development-2026-manifest-v3-plasmo-wxt-side-panel-api-deep-dive.ja ブラウザ拡張機能の開発は、2024年6月に Chrome が Manifest V2 を恒久的に終了させたことで、まったく別世界になった。バックグラウンドページはサービスワーカーへ、blocking webRequest は declarativeNetRequest へ、そして Side Panel API と Offscreen Documents API が新しい可能性を切り拓いた。本稿は 2026 年の拡張機能スタックを、Plasmo や WXT のようなモダンなフレームワーク、細部の異なる Firefox MV3、iOS にも進出した Safari Web Extensions、Edge Add-ons、AI 連携、そして Kakao・Naver・pixiv を含む韓国・日本の生態系まで、一気通貫で整理する。 Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) browser-extensionmanifest-v3mv3plasmowxtvite-web-extensionchrome-extensionsmozilla-webextensionssafari-web-extensionsedge-add-onsside-panel-apideclarativenetrequestservice-worker2026deep-dive日本語 https://www.youngju.dev/blog/culture/2026-05-16-browser-extension-development-2026-manifest-v3-plasmo-wxt-side-panel-api-deep-dive https://www.youngju.dev/blog/culture/2026-05-16-browser-extension-development-2026-manifest-v3-plasmo-wxt-side-panel-api-deep-dive 브라우저 익스텐션 개발은 2024년 6월 Chrome이 Manifest V2를 영구 종료하면서 완전히 다른 세계가 되었다. 백그라운드 페이지는 서비스 워커가 되었고, blocking webRequest는 declarativeNetRequest로 대체되었으며, Side Panel API와 Offscreen Documents API가 새로운 가능성을 열었다. 이 글은 2026년의 익스텐션 개발 스택을 — Plasmo와 WXT 같은 모던 프레임워크, Firefox MV3의 미묘한 차이, Safari Web Extensions의 iOS 진출, Edge Add-ons, AI in 익스텐션, 카카오·네이버·ピクシブ 같은 한국·일본 생태계까지 — 한 호흡으로 정리한다. Sat, 16 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) browser-extensionmanifest-v3mv3plasmowxtvite-web-extensionchrome-extensionsmozilla-webextensionssafari-web-extensionsedge-add-onsside-panel-apideclarativenetrequestservice-worker2026deep-dive