I have found doing this unnecessary (for me) because just searching for "mdn whatever" in google gets me the MDN results I wanted as the top result with the rest of the page being populated by other related MDN results.
Not saying that people shouldn't do it. Just offering a possible simpler alternative to be tested as well
I had actually wanted to reply my original post to people discussing mdn not being the first result on a google search but I find my general work flow falls around ctrl+t (new tab) - I have a specialized extension for something on that page so it doesn't redirect me to google.ca. For a search I just type 'm' as I have it setup to be my main keyword and 'y' for youtube along with 'h' for hacker news search. And if I want to do a search from the same tab I do alt+l to get to url and I'm not losing any thought process or needing to filter through some other ad garbage coming from google when I'm in the flow, just get me to the meat and potatoes (of course YouTube and hackernews are not things I search for regularly during productive work flows ;) )
Not saying that people shouldn't do it. Just offering a possible simpler alternative to be tested as well