Examine source code of LoopControl

{
  "manifest_version": 2,
  "name": "LoopControl",
  "version": "1.0.0",
  "description": "Loop specific sections of videos with keyboard shortcuts and visual controllers.",
  "homepage_url": "https://github.com/aprestoes/loopcontrol",
  "permissions": [
    "storage"
  ],
  "icons": {
    "32": "icons/icon-32.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "all_frames": true,
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ],
      "js": [
        "vsl.js"
      ],
      "css": [
        "inject.css"
      ],
      "match_about_blank": true,
      "exclude_matches": [
        "https://plus.google.com/hangouts/*",
        "https://www.google.com/flights/*",
        "https://hangouts.google.com/*",
        "https://meet.google.com/*"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    },
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@aprestoes"
    }
  },
  "web_accessible_resources": [
    "inject.css",
    "shadow.css"
  ]
}