Ask HN: Search Engine Selector below address bar

Rather than always having to switch my default search engine by going through some settings, wouldn't it be nice just to have a set of buttons that I can configure that appear just below the search I make in the address bar? I type in whatever keywords I want, and then I click the icon for the search engine I want to use. For example if I want to search Amazon products, I can click on an Amazon button. If I went to search the Chinese search engine Baidu because I just type something in Chinese that I want to search for, I can do that. And then perhaps if I do nothing, I could just hit enter and get a Google search if that is my default. What would be wrong with that? How do I get this technology? It seems easy enough.

And my default search engine could still display autocomplete possibilities below these buttons.