Examine source code of Text Rewriter

{
  "manifest_version" : 2 ,
  "name" : "Text Rewriter",
  "description" : "Replace specified phrases on a page",
  "author": "Peter Elmers",
  "version" : "1.8.1",
  "options_ui" : {
    "page": "data/prefs.html" 
  },
  "browser_action" : {
    "default_icon" : "data/icon.png"
  },
  "content_scripts" : [
    {
      "matches" : [
        "http://*/*" ,
        "https://*/*" 
      ],
      "js" : [
        "data/text-rewriter.js" 
      ],
      "all_frames" : false ,
      "run_at" : "document_idle" 
    }
  ],
  "permissions" : [
    "storage" ,
    "tabs" 
  ],
  "background" : {
    "scripts" : [
      "lib/main.js" 
    ],
    "persistent" : false 
  },
  "icons" : {
    "48" : "data/icon.png",
    "64" : "data/icon64.png"
  }
}