why does google have a console, what is it for, what can you do with it, and is it safe to use?

Question

I know you can do some cool stuff in console, but is it safe? (And out of curiosity, why is it there?)

Answer 1

can change value of variable :|

http://www.codecops.in/2015/04/hack-google-chrome-runner-game.html?m=1

Answer 2

For something like that lol
is it safe?
Nope Some google website made security handler about this

Also It can test performance of algorithm/function

try console.time() which is javascript's function

Answer 3

How is it unsafe?

Answer 4

Yeah I know about Runner and those console commands, and I can change speed, jump height, and tons of other stuff.