Examine source code of Stash

{
  "manifest_version": 2,
  "name": "Stash",
  "version": "2.2",
  "description": "Store and restore windows and tabs.",
  "icons": {
    "48": "assets/icon-48.png",
    "96": "assets/icon-96.png"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "assets/icon.svg",
    "default_title": "Stash",
    "default_popup": "src/stash.html",
    "theme_icons": [
      {
        "light": "assets/icon-light.svg",
        "dark": "assets/icon.svg",
        "size": 32
      }
    ]
  },
  "options_ui": {
    "page": "src/options.html",
    "browser_style": true
  },
  "applications": {
    "gecko": {
      "id": "firefox-stash@glob.com.au"
    }
  }
}