Explain Everything Extension

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Explain Everything Extension",
  "version": "1.0.4",
  "author": "Explain Everything",
  "description": "Add files from Slack to your online whiteboard",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "background": {
    "page": "background.html",
    "persistent": false
  },
  "externally_connectable": {
    "matches": [
      "https://whiteboard.explaineverything.com/*"
    ]
  },
  "browser_action": {
    "default_icon": "icon-32.png"
  },
  "minimum_chrome_version": "23",
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "permissions": [
    "https://files.slack.com/",
    "https://slack-files.com/"
  ]
}