Examine source code of Open in Sidebar

{
  "author": "igorlogius",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "manifest_version": 2,
  "name": "Open in Sidebar",
  "description": "Open links, pages or bookmarks into the sidebar",
  "version": "1.0.1",
  "sidebar_action": {
    "default_icon": "icon.png",
    "open_at_install": false,
    "default_panel": "panel.html"
  },
  "permissions": [
    "menus",
    "bookmarks",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking"
  ],
  "icons": {
    "512": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d577bf55-c634-4f36-a8d2-841ab24ee5ac}"
    }
  }
}