Examine source code of Oyster Catcher

{
  "name": "Oyster Catcher",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "ShalderH2.jpg"
    },
    "colors": {
      "frame": "rgba(237, 211, 133, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(240, 217, 135, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(240, 217, 135, 0.05)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f02f4b81-3be9-416f-b90a-5809ad4ae544}"
    }
  }
}