Examine source code of Highlighter for Humans

{
  "manifest_version": 2,
  "name": "Highlighter for Humans",
  "version": "0.0.4",
  "icons": {
    "48": "svg/greenhighlighter.svg",
    "96": "svg/greenhighlighter.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "/content_script.js"
      ],
      "css": [
        "/content_style.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "web-accessible/*"
  ],
  "page_action": {
    "browser_style": true,
    "show_matches": [
      "<all_urls>"
    ],
    "default_icon": {
      "19": "svg/greenhighlighter.svg",
      "38": "svg/greenhighlighter.svg"
    },
    "default_title": "Highlighter for Humans",
    "default_popup": "/popup.html"
  },
  "permissions": [
    "activeTab"
  ]
}