Examine source code of Highlight Me!

{
  "manifest_version": 2,
  "name": "highlight-me",
  "version": "1.0.0",
  "license": "GPL-3.0-only",
  "description": "An extremely simple and minimal text highlighting tool.",
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}