Examine source code of CoronaBlocker

{
  "manifest_version": 2,
  "name": "CoronaBlocker (NL)",
  "description": "CoronaBlocker vervangt viruswoorden voor vriendelijkere alternatieven.",
  "version": "2.1",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {},
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}