Examine source code of Easy Github1s

{
  "description": "easy jump to github1s",
  "author": "hycares",
  "manifest_version": 2,
  "name": "Easy Github1s",
  "version": "1.0.0",
  "icons": {
    "32": "icons/g1s-32.png",
    "48": "icons/g1s-48.png",
    "96": "icons/g1s-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://github.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "*://github.com/*/*"
  ],
  "page_action": {
    "default_title": "Open in GitHub1s",
    "default_icon": {
      "48": "icons/g1s-48.png",
      "96": "icons/g1s-96.png"
    },
    "show_matches": [
      "*://github.com/*/*"
    ]
  },
  "applications": {
    "gecko": {
      "id": "noreplay@null.com"
    }
  }
}