Examine source code of FoxColorBox

{
  "description": "Change and customize browser Window colors",
  "manifest_version": 2,
  "version": "1.3",
  "name": "foxcolorbox",
  "homepage_url": "https://github.com/jftuga/foxcolorbox",
  "icons": {
    "128": "foxcolorbox-128.png"
  },
  "browser_action": {
    "default_icon": {
      "128": "foxcolorbox-128.png"
    },
    "default_title": "Fox Color Box",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "popup.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{290f4621-ce11-49af-9194-bc7364298044}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "theme",
    "activeTab",
    "storage",
    "sessions"
  ]
}