Unfortunately, the proposed workaround cannot be used with manifest v3. The webRequest API is not available from non-persistent background pages (or service workers) and v3 forbids persistent background pages. The declarativeNetRequest allows redirecting to a path in your extension, but via this route the original request is not available. A workaround for this is to redirect using a regexSubstitution. This works fine in Chrome, but not in Safari, because redirects to safari-web-extension:// are blocked. I've filed a bug report for this: https://bugs.webkit.org/show_bug.cgi?id=256054 . As it stands now, I see no way of implementing an OAuth2 redirection flow in a manifest v3 extension on Safari.
papegaaij
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