Examine source code of TomatoTomato

{
  "manifest_version": 2,
  "name": "TomatoTomato",
  "version": "1.2resigned1",
  "applications": {
    "gecko": {
      "id": "TomatoTomato@TomatoTomatoPotatoPotato.com",
      "strict_min_version": "48.0"
    }
  },
  "description": "A Pomodoro/Focus timer extension that blocks distracting websites during your work sessions.",
  "icons": {
    "48": "icons/pomo48.png",
    "96": "icons/pomo96.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "storage",
    "notifications"
  ],
  "web_accessible_resources": [
    "redirect/blocked.html",
    "redirect/blocked.css"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options/options.html"
  },
  "browser_action": {
    "default_icon": "icons/pomo48.png",
    "default_title": "TomatoTomato",
    "default_popup": "popup/menu.html"
  }
}