Add it as a custom search engine in Chrome by entering chrome://settings/searchEngines
in the search bar and clicking "add".
For the url just write javascript:
and then paste the contents of toggle_gh.js
after the colon, and hit save.
Alternatively, if you'd like a button, you can just paste the javascript: ...
as a "new page" in bookmarks.
Like this:
![screen shot 2019-03-05 at 9 18 27 am](https://user-images.githubusercontent.com/77472/53811961-7672fd80-3f28-11e9-80d8-3aad95182b60.png)
I ended up changing the keyword to simply
tog