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Firefox [finally supports `ExecutionWorld.MAIN`](https://bugzilla.mozilla.org/show_bug.cgi?id=1736575) in content scripts, which means we can migrate the browser extension to Manifest V3. This PR also removes a bunch of no longer required explicit branching for Firefox case, when we are using Manifest V3-only APIs. We are also removing XMLHttpRequest injection, which is no longer needed and restricted in Manifest V3. The new standardized approach (same as in Chromium) doesn't violate CSP rules, which means that extension can finally be used for apps running in production mode.
This directory contains code shared between several DevTools packages:
- /packages/react-devtools-core
- /packages/react-devtools-extensions
- /packages/react-devtools-inline
It is not published or released anywhere directly.