This was a bit confusing for me to read at first. DDF is of course a search engine and doesn't need to be installed. DDG now also has an extension which block

This was a bit confusing for me to read at first. DDF is of course a search engine and doesn't need to be installed. DDG now also has an extension which blocks FloC (a feature which the uBlockOrigin extension seems to not have full support for - correct me I could be wrong, but that looks like an open issue?) So you can install the DDG extension now, or install the uBlockOrigin extension - but possibly have to wait for full integration.