On many sites, if you use their search box, next time you start typing the site's URL in Chrome you can press TAB to search the site directly. I think similar things work in other browsers like Firefox too. Q2A should add support for this!
See here for more details: http://stackoverflow.com/questions/7630144/how-to-add-google-chrome-omnibox-search-support-for-your-site
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April 20, 2021: Q2A 1.8.6 released!