Examine source code of FireBlocks

{
  "manifest_version": 2,
  "name": "FireBlocks",
  "author": "Alexander Lyon",
  "version": "1.5",
  "description": "Easily block websites using regular expressions.",
  "homepage_url": "https://github.com/arlyon/fireblocks",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "<all_urls>"
  ],
  "icons": {
    "48": "images/logo.svg",
    "96": "images/logo.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "images/logo.svg",
    "blocked.html",
    "blocked.js"
  ],
  "options_ui": {
    "page": "options.html"
  }
}