Examine source code of Encoder/Decoder

{
  "manifest_version": 2,
  "name": "Encoder/Decoder",
  "version": "1.4.3",
  "description": "URL encode/decode, MD5 encode, time format conversion",
  "author": "likefei",
  "icons": {
    "48": "imgs/icon-small.png",
    "128": "imgs/icon.png"
  },
  "browser_action": {
    "default_icon": "imgs/icon.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content-script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "inject.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{64d5972d-f23f-454d-be9e-577403373b71}"
    }
  }
}