Examine source code of Just a Password Generator

{
  "manifest_version": 2,
  "name": "Password Generator",
  "version": "1.0",
  "description": "Generate random and strong passwords for your accounts!",
  "icons": {
    "48": "icons/password_generator_firefox_48.png",
    "96": "icons/password_generator_firefox_96.png"
  },
  "browser_action": {
    "default_icon": "icons/password_generator_firefox_48.png",
    "default_title": "Password Generator",
    "default_popup": "password_gen_popup_firefox.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b9850ef0-4fa5-49eb-bd22-737ca0f3662e}"
    }
  }
}