Examine source code of CoronaReplace

{
  "manifest_version": 2,
  "name": "CoronaReplace",
  "version": "1.2",
  "description": "Replaces 'corona' and related terms with other c-words.",
  "icons": {
    "48": "icon/corona-icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "corona-replace.js"
      ]
    }
  ]
}