Thread:Project:Current issues/Link to list open tasks from the extension's page displays both open and closed tasks/reply (5)

As Nemo says. If you want to get a PHID of a project (e.g. Flow): Go to https://phabricator.wikimedia.org/conduit/method/project.query/, enter ["Flow"] in names, get PHID-PROJ-ntg6sf6mfl2qm2e4qgxc.