You can continue to use Ublock Origin, which uses the v2 manifest. The delisted extension, Ublock Origin lite, is a v3 manifest plugin. Apparently it was creat

You can continue to use Ublock Origin, which uses the v2 manifest. The delisted extension, Ublock Origin lite, is a v3 manifest plugin. Apparently it was created to address chrome blocking the v2 extension, but you can continue to use the v2 extension on Firefox