Examine source code of Mush'it !

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "version": "7.0.0",
  "description": "__MSG_extDesc__",
  "icons": {
    "16": "images/app-icon@16x16.png",
    "32": "images/app-icon@32x32.png",
    "48": "images/app-icon@48x48.png",
    "128": "images/app-icon@128x128.png",
    "256": "images/app-icon@256x256.png"
  },
  "minimum_chrome_version": "66.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "mushit@mymushin.com",
      "strict_min_version": "63.0"
    }
  },
  "browser_action": {
    "default_icon": "images/app-icon@16x16.png",
    "default_popup": "popup.html"
  },
  "externally_connectable": {
    "matches": [
      "https://dev-web.mymushin.com/*",
      "https://app.mymushin.com/*",
      "https://pre-prod.mymushin.com/*"
    ]
  },
  "background": {
    "scripts": [
      "jquery-3.1.1.min.js",
      "sentry-4.2.4.min.js",
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "exclude_globs": [
        "https://www.youtube.com/*",
        "mymushin.com/*",
        "*.mymushin.com/*",
        "localhost/*",
        "*.deezer.com/*",
        "*.clxeurope.com/*",
        "https://mail.google.com/*",
        "*.gouv.fr*"
      ],
      "matches": [
        "*://*/*"
      ],
      "css": [
        "content.css"
      ],
      "js": [
        "jquery-3.1.1.min.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "default_locale": "en",
  "permissions": [
    "storage",
    "notifications",
    "contextMenus",
    "tabs"
  ],
  "web_accessible_resources": [
    "fonts/*.*",
    "images/*.*"
  ]
}