Gmail Classic

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Gmail Classic",
  "version": "1.3",
  "description": "Revert my gmail",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "options.html",
    "default_title": "Classic Gmail Options",
    "default_icon": {
      "19": "images/icon19.png",
      "38": "images/icon38.png"
    }
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "web_accessible_resources": [
    "classic.js",
    "shadow.css",
    "buttons.css",
    "compose.css",
    "lefticons.css",
    "tabs.css",
    "search.css"
  ],
  "background": {
    "scripts": [
      "jquery-3.3.1.min.js",
      "jscolor.js"
    ]
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/mail/u/0*"
      ],
      "js": [
        "jquery-3.3.1.min.js",
        "classic.js"
      ],
      "run_at": "document_start"
    }
  ]
}