Examine source code of Cite This!

{
  "manifest_version": 2,
  "name": "Cite This!",
  "description": "Cite this allows you to easily retrieve citations for the websites you visit.",
  "version": "0.27",
  "applications": {
    "gecko": {
      "strict_min_version": "54.0a1",
      "id": "citethis@angelforge.org"
    }
  },
  "sidebar_action": {
    "default_icon": "icons/citethis.png",
    "default_title": "CiteThis!",
    "default_panel": "sidebar/panel.html"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "<all_urls>"
  ],
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "linux": "Ctrl+Alt+C"
      }
    }
  }
}