Examine source code of PDF Tools for Firefox

{
  "_comment": "Firefox adaptation of PDF_Tools by Juan José de Haro (https://bilateria.org) - Original work by Pablo Felip (https://www.linkedin.com/in/pfelipm/) - Licensed under GPL v3",
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "version": "1.1.1",
  "description": "__MSG_appDescription__",
  "default_locale": "en",
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "sidebar_action": {
    "default_title": "__MSG_actionTitle__",
    "default_panel": "panel.html",
    "default_icon": "images/icon48.png"
  },
  "browser_action": {
    "default_title": "__MSG_actionTitle__"
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pdf-tools@jjdeharo.bilateria.org",
      "strict_min_version": "58.0"
    }
  }
}