Examine source code of Linkificator

{
  "manifest_version": 2,
  "name": "Linkificator",
  "version": "3.3.3",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "16": "resources/icons/link16-on.png",
    "32": "resources/icons/link32-on.png",
    "48": "resources/icons/icon48.png",
    "64": "resources/icons/icon64.png",
    "128": "resources/icons/icon128.png"
  },
  "developer": {
    "name": "MarkaPola",
    "url": "https://github.com/MarkaPola/Linkificator"
  },
  "default_locale": "en_US",
  "applications": {
    "gecko": {
      "id": "linkificator@markapola",
      "strict_min_version": "60.0"
    }
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "history",
    "storage",
    "alarms"
  ],
  "options_ui": {
    "browser_style": true,
    "page": "options/options.html"
  },
  "browser_action": {
    "browser_style": true,
    "default_area": "navbar",
    "default_icon": {
      "16": "resources/icons/link16-on.png",
      "32": "resources/icons/link32-on.png"
    },
    "default_title": "Linkificator",
    "default_popup": "popup/popup.html"
  },
  "commands": {
    "Toggle": {
      "description": "__MSG_settings@shortcuts@toggle__ (Alt+Shift+O)"
    },
    "Manual": {
      "description": "__MSG_settings@shortcuts@manual__ (Alt+Shift+M)"
    },
    "Manage": {
      "description": "__MSG_settings@shortcuts@manage__ (Alt+Shift+X)"
    },
    "Update": {
      "description": "__MSG_settings@shortcuts@update__ (Alt+Shift+U)"
    }
  },
  "background": {
    "scripts": [
      "options/ShortcutCustomizeUI.js",
      "configurator.js",
      "controler.js",
      "main.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*",
        "file://*/*"
      ],
      "all_frames": true,
      "run_at": "document_end",
      "js": [
        "resources/js/thread.js",
        "resources/js/DOMutils.js",
        "content_scripts/statistics.js",
        "content_scripts/linkificator.js"
      ]
    }
  ]
}