Examine source code of Tanaguru

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "short_name": "Tanaguru webext RGAA4",
  "version": "5.1.1",
  "author": "Tanaguru",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "http://www.tanaguru.com/fr/",
  "icons": {
    "32": "ressources/images/icons/tanaguru-32-dark.png",
    "48": "ressources/images/icons/tanaguru-48.png",
    "96": "ressources/images/icons/tanaguru-96.png"
  },
  "permissions": [
    "<all_urls>",
    "downloads",
    "notifications"
  ],
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "32": "ressources/images/icons/tanaguru-32-dark.png"
    },
    "default_title": "__MSG_extensionName__",
    "default_popup": "popup/tanaguru-popup.html",
    "theme_icons": [
      {
        "light": "ressources/images/icons/tanaguru-32-light.png",
        "dark": "ressources/images/icons/tanaguru-32-dark.png",
        "size": 32
      }
    ]
  },
  "background": {
    "scripts": [
      "ressources/scripts/background_scripts/background.js"
    ]
  },
  "devtools_page": "devtools/tanaguru-devtools.html",
  "default_locale": "fr",
  "browser_specific_settings": {
    "gecko": {
      "id": "webext@tanaguru.com"
    }
  }
}