You ended up on a file in a random revision:

How do you get to master?

Oh god.

What if... ?

(better icon needed, perhaps)

However finding HEAD is not always easy. We can literally use HEAD in the link, but that would not enable the edit/delete buttons. Example: https://github.com/sindresorhus/refined-github/blob/HEAD/source/content.js

Only folders seem to have this piece of information available on the page, so we might at least provide a link on these pages: