You can add a VizieR search engine in your browser.
This will allow you to directly access the query page for one particular catalogue (by providing its name or code: 2mass, II/246, 2246...), or to search catalogues by author, keyword, ...
Simply open the main VizieR web page.
You can either install the search engine by clicking on the link:
Or install it from the search engine menu:
To perform a search, just select the VizieR engine: