Package: chromium Version: 140.0.7339.127 Manifest V2 is no longer enableable though chrome://flags. I suggest the following launch option is added to the .desktop file for Chromium: --disable-features=ExtensionManifestV2Unsupported,ExtensionManifestV2Disabled
I know Google will probably completely rip out manifest V2 support in the future, and we should be using Firefox (which I do), but a usable Chromium (the internet is unusable without content blocking) is a nice-to-have for compatibility testing.

