code: function(tabId, url) {
          var entry = tabContexts.get(tabId);
          if ( entry === undefined ) {
              entry = push(tabId, url);
          } else if ( entry.commit(url) ) {
              popupCandidateTest(tabId);
          }
          return entry;
      }
docs: https://github.com/gorhill/uBlock/issues/1735 Filter for popups if actually committing.