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"
  }
}