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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Grayscaler",
  "description": "Applies a grayscale filter on included tabs, websites, or all websites except those excluded.",
  "version": "1.1",
  "author": "Elijah Cantu",
  "background": {
    "service_worker": "js/background.js"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "js/content.js",
        "js/manageSites.js"
      ],
      "run_at": "document_start"
    }
  ],
  "options_page": "options.html",
  "icons": {
    "16": "icons/16on.png",
    "32": "icons/32on.png",
    "48": "icons/48on.png",
    "128": "icons/128on.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/16off.png",
      "32": "icons/32off.png",
      "48": "icons/48off.png",
      "128": "icons/128off.png"
    },
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "tabs",
    "webNavigation"
  ]
}