Examine source code of Remember that Thing

{
  "manifest_version": 2,
  "name": "Remember that Thing",
  "version": "0.4",
  "description": "Simple todo list application. But privacy concious since all your data stays right in your browser. Just though, you know, remember that thing!",
  "homepage_url": "https://github.com/basti42/Remember-that-thing",
  "browser_specific_settings": {
    "gecko": {
      "id": "basti.addon.dev@gmail.com"
    }
  },
  "background": {
    "scripts": [
      "background_scripts/backend.js",
      "background_scripts/landing_page_finder.js"
    ]
  },
  "icons": {
    "48": "icons/icon_48.png",
    "96": "icons/icon_96.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "unlimitedStorage"
  ],
  "browser_action": {
    "default_icon": "icons/icon_32.png",
    "default_title": "Remember that Thing"
  }
}