Examine source code of YouTube Filter & timer

{
  "name": "YouTube Filter",
  "version": "0.0.5",
  "manifest_version": 2,
  "description": "A Firefox extension that filters out distractions on YouTube",
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "19": "icons/icon.png",
      "38": "icons/icon.png"
    },
    "default_title": "YouTube Filter"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "https://www.youtube.com/*",
    "alarms"
  ],
  "icons": {
    "16": "icons/icon.png",
    "48": "icons/icon.png",
    "128": "icons/icon.png",
    "256": "icons/icon.png"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content/content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dadf1707-ccb0-4349-895a-13f4b6a07695}"
    }
  }
}