Printing Full Report Under Firefox Tip
I believe this is a Firefox problem not a Cronometer one but the net effect is still the same. On both Linux and Mac if you printed this to a file or a printer you'd see this:
Rather than what you usually see on screen:
This is a problem on both Mac and Linux with Firefox. This is not a problem with Safari. The way to fix this is to turn on the background colors and images in the extended printing settings when you go to print. Below are screenshots of where the settings are under macOS and Ubuntu MATE Linux. I imagine they will be in comparable places on other operating systems.
Ubuntu MATE Settings Screenshot:
macOS settings screenshot: