Examine source code of Request Blocker

{
  "manifest_version": 2,
  "name": "Request Blocker",
  "version": "0.6.2",
  "description": "Block requests with URL match patterns",
  "icons": {
    "48": "icon.svg"
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "util.js",
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8b0dd2c0-b9e8-46d5-b360-e2c53e43f2bc}"
    }
  }
}