By “viewer”, I mean legacysurvey.org
I’m using Firefox in MacOS (High Sierra something). At the bottom right of the page, I see four (maybe five) cyan separated text strings: “Tips & Tricks”, Leaflet", “Source”, …
Putting my mouse over them, I see they are links, e.g. github.com/legacysurvey/decals-web. However, when I click on any of them, nothing happens! 
Not part of this question, but to do with user experience: I now know that if I left-click on something in a legacysurvey image, I get choices like Link Here, and Data (and Discuss This Object
). Silly me, I thought I had to right-click to get that! Presumably this is all carefully explained in Tips & Tricks … if only I could open that webpage! 
