Examine source code of TogetherJS Companion

{
  "description": "Add TogetherJS with a click",
  "manifest_version": 2,
  "name": "TogetherJS Companion",
  "version": "1.0.2resigned1",
  "homepage_url": "https://github.com/Mte90/TogetherJS-Companion",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png"
  },
  "web_accessible_resources": [
    "js/init.js",
    "js/inject.js",
    "js/content-inject.js",
    "js/togetherjs-min.js"
  ],
  "background": {
    "scripts": [
      "js/init.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content-inject.js"
      ]
    }
  ],
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{103d31cf-35f7-4fab-8a82-8fb065dc02c8}"
    }
  }
}