Examine source code of Anolight

{
  "manifest_version": 2,
  "name": "Anolight",
  "version": "1.0",
  "description": "Adds highlighting functionality to webpages",
  "icons": {
    "48": "./icons/marker-48.png"
  },
  "browser_action": {
    "default_icon": "./icons/marker-48.png",
    "default_title": "Anolight Options",
    "default_popup": "index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./scripts/content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "./scripts/background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus"
  ]
}