Chrome MV3

Manifest V3 is the latest iteration of the Chrome extension platform, prioritizing security, privacy, and performance through service workers and declarative APIs.

Chrome MV3 shifts the extension architecture from persistent background pages to ephemeral service workers, significantly reducing browser memory overhead. It replaces the broad webRequest API with declarativeNetRequest, allowing developers to define up to 30,000 static rules for content filtering without accessing raw user data. This update enforces a strict Content Security Policy (CSP) by banning remotely hosted code: all logic must be bundled within the package to ensure transparent review processes. These changes streamline extension execution while providing users with granular control over site permissions and data privacy.

https://developer.chrome.com/docs/extensions/mv3/intro/