Examine source code of Set Aside

{
  "applications": {
    "gecko": {
      "strict_min_version": "59.0a1"
    }
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Set Aside",
    "default_popup": "setAside.html",
    "default_icon": {
      "32": "icons/SetAsideIcon.png"
    },
    "theme_icons": [
      {
        "light": "icons/SetAsideIcon.png",
        "dark": "icons/SetAsideIconLight.png",
        "size": 32
      }
    ]
  },
  "description": "A list of methods you can perform on a tab.",
  "homepage_url": "https://github.com/Uzair-Fasih/Set-Aside-for-Mozilla-Firefox",
  "manifest_version": 2,
  "name": "Set Aside",
  "permissions": [
    "<all_urls>",
    "tabs",
    "storage"
  ],
  "icons": {
    "32": "icons/SetAsideIconLight.png"
  },
  "version": "1.0"
}