This works in Chromium - I don't have chrome.

Into the URL bar enter chrome://extensions-internals
ctrl-f to search and enter manifest_version

I see a couple of extensions, among other stuff:

"location": "INTERNAL",
   "manifest_version": 2,
   "name": "uBlock Origin",

"location": "INTERNAL",
   "manifest_version": 3,
   "name": "Mudcat Browser Tools"

Most extensions are probably still MV2 and will need updating when (if?) Google start blocking them.

Content (advert) blockers, like uBlock origin, may not be able to comply with MV3 - that's why Google introduced it!

An image-saver should have no trouble, so I expect it will be updated if it's still being maintained.