Disable YouTube Cards

manifest.json

{
  "name": "Disable YouTube Cards",
  "description": "Disable end cards that show during the last 5-20 seconds of a video.",
  "version": "1.2resigned1",
  "applications": {
    "gecko": {
      "id": "{93594D08-DD2E-11E7-A06E-99FCD3B1BEE7}",
      "strict_min_version": "48.0"
    }
  },
  "permissions": [
    "tabs",
    "https://www.youtube.com/*",
    "contextMenus",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options/options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "default_icon": "images/icon19.png",
    "default_popup": "browser_action/popup.html"
  },
  "manifest_version": 2
}