Examine source code of etictags

{
  "manifest_version": 2,
  "name": "etictags",
  "description": "__MSG_appDesc__",
  "default_locale": "fr",
  "version": "1.0.0.19resigned1",
  "applications": {
    "gecko": {
      "id": "{8de38093-9e2f-4aa0-9180-714f59ab4f5b}",
      "strict_min_version": "43.0"
    }
  },
  "page_action": {
    "default_icon": {
      "19": "iconon19x19.png",
      "38": "iconon38x38.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "https://ajax.googleapis.com/",
    "https://storage.googleapis.com/",
    "http://www.etictags.org/",
    "https://www.etictags.org/"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "etictags-cs.css"
      ],
      "js": [
        "jquery-3.1.1.min.js",
        "etictags-common.js",
        "base64.js",
        "fc-ext.min.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "jquery-3.1.1.min.js",
      "etictags-common.js",
      "base64.js",
      "bckgrnd.min.js"
    ]
  },
  "web_accessible_resources": [
    "logoplus.png",
    "logominus.png",
    "backgrnd-cause.png"
  ]
}