Examine source code of Heart Me

{
  "name": "Heart Me",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "hearts4.gif"
    },
    "colors": {
      "frame": "rgba(21, 23, 28, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3741c598-d4d6-466b-b0b9-4bf4ab4d4056}"
    }
  }
}