Examine source code of Open Panels

{
  "manifest_version": 2,
  "name": "Open Panels",
  "version": "1.0",
  "description": "View and create custom tweets with borderless images",
  "icons": {
    "48": "icons/icon48.png"
  },
  "permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "shortcuts.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*"
      ],
      "js": [
        "whitelist.js",
        "tweetEnhancer.js"
      ]
    }
  ],
  "page_action": {
    "default_icon": "icons/icon32.png",
    "default_title": "Open Panel Generator",
    "default_popup": "popup/generator.html",
    "show_matches": [
      "*://twitter.com/*"
    ]
  },
  "web_accessible_resources": [
    "resources/*.png"
  ],
  "commands": {
    "disablePanel": {
      "suggested_key": {
        "default": "Alt+P"
      },
      "description": "Disable the open panel your mouse is hovering over. (This will not prevent the extension from reloading it if you scroll away from it and back.)"
    },
    "disableAllPanels": {
      "suggested_key": {
        "default": "Alt+Shift+P"
      },
      "description": "Disable all currently loaded open panels. (This will not prevent the extension from reloading them if you scroll away from them and back.)"
    }
  }
}