FAILED TO FIND GAME! on Ubuntu 17.10

[SuuSoJeat]

Invalid MIT-MAGIC-COOKIE-1 keyFAILED TO FIND GAME!``

[jwjohns]

I get the same

[ahsanatha]

same here

[chipytux]

same here

[ctcruz]

I found the solution!
This warning message is shown cause the screen is much large and the script have a limitation of scaned pixels.
Resize the browser window and execute it again.

[dario-bandeira]

In my case it just worked when I made some changes:

1. line 10 on GameManipulator.js from
   var COLOR_DINOSAUR = '535353';
   to
   var COLOR_DINOSAUR = '545454';
   but dino color really is '535353', so I don't know why

2. line 142 on GameManipulator.js from
   GameManipulator.offset[1] + GameManipulator.gameOverOffset[1]
   to
   GameManipulator.offset[1] + GameManipulator.gameOverOffset[1] - 10
   cause the 'game over' reader was reading a little under the word 'game' and not founding it.

I'm using Chrome on Ubuntu 18.04