Examine source code of Title Changer

{
  "manifest_version": 2,
  "name": "Title Changer",
  "description": "Changes the title of all websites to \"-\"",
  "version": "0.1.1resigned1",
  "author": "MasterOfTheTiger",
  "applications": {
    "gecko": {
      "id": "titles@mtiger.tk",
      "strict_min_version": "42.0"
    }
  },
  "permissions": [
    "<all_urls>",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Title Changer",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}