Examine source code of Github Code Font Changer

{
  "manifest_version": 2,
  "name": "Github Code Font Changer",
  "description": "Change and customize the boring GitHub code viewer font",
  "version": "2.2",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "github-code-font-changer@firefox",
      "strict_min_version": "88.0"
    }
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.github.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "storage",
    "https://*.github.com/*"
  ]
}