Etherscan Transaction Cancellation

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Etherscan Transaction Cancellation",
  "version": "0.1.2",
  "manifest_version": 2,
  "description": "This extension allows canceling pending transactions on Etherscan.",
  "permissions": [
    "declarativeContent"
  ],
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "content.js"
      ],
      "matches": [
        "https://*.etherscan.io/*"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "pageScript.js"
  ],
  "page_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/logo16.png",
      "32": "images/logo32.png",
      "48": "images/logo48.png",
      "128": "images/logo128.png"
    }
  },
  "icons": {
    "16": "images/logo16.png",
    "32": "images/logo32.png",
    "48": "images/logo48.png",
    "128": "images/logo128.png"
  }
}