Examine source code of YouCap

{
  "manifest_version": 2,
  "name": "YouCap",
  "version": "0.3.0",
  "default_locale": "en",
  "description": "An extension for YouCap, a community-driven alternative to YouTube's community captions.",
  "homepage_url": "https://youcap.video",
  "icons": {
    "16": "icons/logo-16.png",
    "32": "icons/logo-32.png",
    "64": "icons/logo-64.png",
    "512": "icons/logo-512.png"
  },
  "page_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/logo-16.png",
      "32": "icons/logo-32.png",
      "64": "icons/logo-64.png",
      "512": "icons/logo-512.png"
    },
    "default_title": "YouCap"
  },
  "background": {
    "scripts": [
      "js/bg.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4ca4ff8-584f-4a7e-b09f-3b8ed2c8abbc}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/watch*",
        "*://www.youtube.com/embed*",
        "*://.youtube-nocookie.com/*"
      ],
      "css": [
        "css/youtube.css"
      ],
      "js": [
        "js/ui.js",
        "js/captions.js",
        "js/youtube.js"
      ]
    }
  ],
  "permissions": [
    "*://raw.githubusercontent.com/*",
    "storage",
    "tabs"
  ],
  "web_accessible_resources": [
    "js/webpage.js",
    "css/youtube.css",
    "icons/logo-white-128.png"
  ]
}