Examine source code of Fox Input

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "fox.input@hemiolasun.tw"
    }
  },
  "author": "SUN Chun-Yen",
  "name": "Fox Input",
  "version": "0.10resigned1",
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "commands": {
    "focus-next": {
      "suggested_key": {
        "default": "Alt+I",
        "mac": "MacCtrl+I"
      },
      "description": "Focus the next input field"
    },
    "focus-previous": {
      "suggested_key": {
        "default": "Alt+J",
        "mac": "MacCtrl+J"
      },
      "description": "Focus the previous input field"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "foxinput.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "<all_urls>",
    "activeTab",
    "webNavigation"
  ]
}