Examine source code of CovHide-19

{
  "manifest_version": 2,
  "name": "CovHide-19",
  "version": "0.1",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jquery-3.4.1.min.js",
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "19": "button-19.png",
      "38": "button-38.png"
    },
    "default_title": "Click to toggle hiding"
  },
  "description": "Take a break from pandemic news! This extension attempts to hide blocks of text that include Coronavirus and COVID-19 by setting the text color to the same as its background color. It is pretty flaky and doesn't work everywhere, but it does help a bit in some places.\nBe prepared to disable the extension if pages aren't rendering properly at all - this is pretty experiemental :)\n\n Coming soon: click-to-toggle"
}