Disable Download Bar

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Disable Download Bar",
  "description": "Adds the option to suppress the download tray or add a keyboard shortcut (default Alt+K) to close it.",
  "version": "0.0.1.1",
  "icons": {
    "48": "icon48.png",
    "128": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "commands": {
    "tray-close": {
      "suggested_key": {
        "default": "Alt+K"
      },
      "description": "Close download tray."
    },
    "open-mostrecentfile": {
      "suggested_key": {
        "default": "Alt+J"
      },
      "description": "Open most recent download."
    }
  },
  "permissions": [
    "storage",
    "downloads",
    "downloads.open",
    "downloads.shelf"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  }
}