Examine source code of Split View

{
  "manifest_version": 2,
  "name": "Split View",
  "description": "Open tabs in a native split view right in your browser",
  "homepage_url": "https://github.com/jrmgx/SplitViewExtension",
  "version": "0.1",
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "management",
    "webNavigation"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "actions.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a9219705-9de9-4925-bdaf-e81108d41335}"
    }
  }
}