Examine source code of BrowserScreen

{
  "manifest_version": 2,
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "name": "BrowserScreen",
  "description": "Resizing Video to fit browser screen",
  "version": "2.0.5",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2c7de26-7f07-466d-8f41-74d83cab5287}",
      "strict_min_version": "42.0"
    }
  },
  "content_scripts": [
    {
      "js": [
        "js/index.js"
      ],
      "matches": [
        "*://*/*"
      ],
      "match_about_blank": true,
      "all_frames": true
    },
    {
      "css": [
        "plyr.css"
      ],
      "matches": [
        "*://*/*"
      ],
      "match_about_blank": true,
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "img/icon128.png"
  },
  "permissions": [
    "tabs",
    "https://cdn.plyr.io/*"
  ]
}