Examine source code of Github Activity Indicator

{
  "manifest_version": 2,
  "name": "Github Activity Indicator",
  "version": "1.0",
  "description": "Shows the number of days since the last commit next to a link to a github repository. Only activates on github.com.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{02694bc9-1d39-4426-b61a-db966c6ebfea}",
      "strict_min_version": "57.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.github.com/*"
      ],
      "js": [
        "addindicators.js"
      ]
    }
  ],
  "permissions": [
    "https://api.github.com/*",
    "storage"
  ]
}