manifest.json

{
  "manifest_version": 3,

  "name": "Shoot the Messenger",
  "description": "This extension sequentially unsends all messenges in a messenger chain.",
  "version": "7.0.0",

  "content_scripts": [
    {
      "matches": ["http://*.messenger.com/*", "https://*.messenger.com/*"],
      "js": ["main.js"],
      "run_at": "document_end"
    }
  ],

  "web_accessible_resources": [
    {
      "resources": ["submitSearch.js"],
      "matches": ["<all_urls>"]
    }
  ],

  "background": {
    "service_worker": "background.js"
  },

  "action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },

  "permissions": ["activeTab", "storage"],
  "host_permissions": [
    "http://*.messenger.com/*",
    "https://*.messenger.com/*"
  ],
  "icons": { "128": "icon.png" },

  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';"
  }
}