Examine source code of Letter bee

{
  "theme": {
    "images": {
      "theme_frame": "test-letterbee.jpg"
    },
    "colors": {
      "frame": "#e8ebb5",
      "tab_background_text": "#061713"
    }
  },
  "version": "2.0",
  "name": "Letter bee",
  "manifest_version": 2,
  "description": "Test test...."
}