Examine source code of Image compare

{
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "version": "0.16",
  "default_locale": "en",
  "icons": {
    "64": "icon.svg",
    "128": "icon.svg"
  },
  "permissions": [
    "storage"
  ],
  "optional_permissions": [
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icon.svg",
    "default_title": "__MSG_extensionName__"
  },
  "background": {
    "scripts": [
      "ep.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "120.0",
      "id": "{f29ddf05-5fe0-4036-91ce-a76ce55dcf0b}"
    },
    "gecko_android": {}
  }
}