Examine source code of GitHub Absolute Dates

{
  "manifest_version" : 3 ,
  "id": "github-absolute-dates",
  "name" : "GitHub Absolute Dates",
  "version" : "1.0",
  "description" : "Convert GitHub's relative timestamps into absolute timestamps.",
  "icons" : {
    "16" : "icons/icon16.png",
    "32" : "icons/icon32.png",
    "192" : "icons/icon192.png"
  },
  "content_scripts" : [
    {
      "matches" : [
        "*://github.com/*" 
      ],
      "js" : [
        "content.js" 
      ],
      "css" : [
        "styles.css" 
      ],
      "run_at" : "document_idle" 
    }
  ],
  "permissions" : [
    "storage" 
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "github-absolute-dates@example.com"
    }
  }
}