Examine source code of Clipboard Inserter

{
  "manifest_version": 2,
  "name": "Clipboard Inserter",
  "version": "0.3.3resigned1",
  "description": "A simple addon that inserts clipboard contents into the page. Uses icon made by Google from www.flaticon.com licensed by CC 3.0 BY",
  "icons": {},
  "applications": {
    "gecko": {
      "id": "@clipboard-inserter"
    }
  },
  "permissions": [
    "activeTab",
    "clipboardRead",
    "storage",
    "file://*/*"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icon/icon16.png",
      "32": "icon/icon32.png",
      "64": "icon/icon64.png"
    },
    "default_title": "Toggle clipboard inserter"
  },
  "background": {
    "page": "bg/index.html"
  },
  "options_ui": {
    "page": "options.html"
  }
}