*this is only true for their native Ad Blocker (of course this fix will only make sense if they approve my previous message).

@lancealot: You need to understand that they said:"For you, this means that you will be able to keep using extensions such as uBlock Origin uninterrupted, instead of switching to the more bare-bones version of uBlock Origin Lite." (right now)... and "We’re happy to share that Opera’s native Ad Blocker is not affected by these changes at all. It will continue to be available beyond the expected June 2025 cutoff of Manifest V2." this is not only true for their native Ad Blocker.
So we still do not really know if Opera will support Manifest V2 after June 2025.
For what they wrote " In the coming days and weeks, we will be reaching out to selected extension developers to determine the best and safest way forward." they will probably not support V2, but maybe they can add something on top to extend V3 to make Ublock Origin works after June 2025.
I still think the only real alternative is Firefox since it is not based on chromium at all.