Examine source code of Fox Pomodoro

{
  "manifest_version": 2,
  "name": "Fox Pomodoro",
  "version": "1.0",
  "description": "A simple pomodoro timer accessible through your browser.",
  "homepage_url": "https://github.com/smsanagustin/fox-pomodoro.git",
  "icons": {
    "64": "icons/tomato-64.png"
  },
  "browser_action": {
    "default_icon": "icons/tomato-64.png",
    "default_title": "Fox Pomodoro",
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "tabs",
    "storage",
    "notifications"
  ],
  "web_accessible_resources": [
    "/prompts/start_pomodoro.html",
    "/prompts/start_break.html"
  ],
  "background": {
    "scripts": [
      "background_scripts/background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d6d4510d-b104-42e9-9b32-47f2fba6f862}"
    }
  }
}