Gmail Append HTML [Keyboard]

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Gmail Append HTML [Keyboard]",
  "description": "Allows the usage of HTML content in Gmail from the context menu and keyboard.",
  "version": "1.0.4",
  "permissions": [
    "contextMenus",
    "clipboardRead"
  ],
  "manifest_version": 2,
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://mail.google.com/*",
        "https://mail.google.com/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "commands": {
    "html_paste": {
      "suggested_key": {
        "default": "Ctrl+Shift+X"
      },
      "description": "Execute Paste as HTML"
    }
  }
}