Examine source code of like-animation

{
  "name": "like-animation",
  "manifest_version": 2,
  "version": "2.1resigned1",
  "theme": {
    "images": {
      "headerURL": "header.png"
    },
    "colors": {
      "accentcolor": "#ffffff",
      "textcolor": "rgba(245, 231, 231, 1)",
      "toolbar": "rgba(41, 2, 33, 0)",
      "toolbar_text": "rgba(185, 193, 235, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c7b2c0fd-6a36-4253-a590-9d114dac5548}"
    }
  }
}