Here they say that in June 2023 Manifest v2 extension will no longer run in Chrome: https://developer.chrome.com/docs/extensions/mv3/mv2-sunset/
Does it also mean that it won't be possible to load manifest v2 extensions in developer mode? Are there any official links or statements about this?
There is this comment in the Chrome Extensions Google Group: "Yes, locally running manifest versions is dependent on the Chrome browser being able to run it - when this ceases in January 2023 this will also end." Here: https://groups.google.com/a/chromium.org/g/chromium-extensions/c/H12F2kETGpg/m/mCmAaabTAwAJ
So apparently manifest v2 extensions will no longer be supported in developer mode from January 2023.