I agree with Paul Graham on this one.
"Has any other company grown to Google's size and remained as benevolent? (Not saying they're perfect, just the best that big.)"
(https://twitter.com/paulg/status/495948643149426688)
I'll stick with Chrome for now as I find it slightly better than firefox.
I agree with all the heuristics mentioned except the one about English grammar. Though most people outside the major cities are educated in English medium, it is very common to them graduate without ever having an actual communication in English. I met a lot of Indians who are not very good with respect to grammar but are amazing programmers with enough communication skills to get the job done.
Yes, the title is slightly misleading and different from the project title "github like contributions calendar on terminal". Adding github support (just to view the same graph on terminal rather than firing the web page for it) is one of the suggestions and is in TODO list.