Google started to phase-out their browser extension interface called
manifest v2.
As for today, manifest v2 is disabled by default, all extension that
are based on manifest v2 are inactive.
Until June 2025 this interface can be temporary enabled.
It requires adding entry to file
ExtensionManifestV2Availability.json.
(root) $ mkdir -p /etc/chromium-browser/policies/managed/
(root) $ echo '{ "ExtensionManifestV2Availability": 2 }' | tee -a /etc/chromium-browser/policies/managed/ExtensionManifestV2Availability.json