Safari is by definition Mac based! I tried installing this handy-looking extension and, despite the admonition from Safari that the extension didn’t have permission to read, alter or send the contents of a webpage (and I couldn’t find a way to give it permission), I did ostensibly find a way to create ‘dh’ as a new search keyword and to couple it to the link provided above. Just for the hell of it I typed in ‘dh inputting rests’ and I got ‘Normal DH processing of input on second-order neurons’. I give up.