Examine source code of DOOM Marine

{
  "name": "Doom Marine",
  "manifest_version": 2,
  "version": "1.1resigned1",
  "theme": {
    "images": {
      "theme_frame": "doom-marine.jpg"
    },
    "colors": {
      "frame": "rgba(0, 33, 16, 1)",
      "tab_background_text": "rgba(140, 140, 140, 1)",
      "toolbar": "rgba(148, 255, 202, 0.15)",
      "bookmark_text": "rgba(217, 217, 217, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.8)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d6d17e62-ed2d-4e24-b47c-25a924dfcd0b}"
    }
  }
}