Examine source code of coloured blocks 2

{
  "theme": {
    "images": {
      "theme_frame": "firefoxhelder1.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "coloured blocks 2",
  "manifest_version": 2,
  "description": "The second version of coloured blocks, a little bit softer, but still coloured. This is because I found it to be a little bit annoying to read the text on the first, bright version."
}