Examine source code of TabFreezer

{
  "description": "TabFreezer – lightweight Firefox tab suspender with pinned-tab startup control and instant discard shortcut. Uses Firefox native discard API.",
  "manifest_version": 2,
  "name": "TabFreezer",
  "version": "1.0.1",
  "author": "TabFreezer contributors",
  "icons": {
    "48": "icons/border-48.png"
  },
  "background": {
    "scripts": [
      "bg.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage",
    "sessions"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "140.0",
      "id": "adam2am@outlook.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "commands": {
    "discard-all-except-current": {
      "suggested_key": {
        "default": "Alt+Shift+F"
      },
      "description": "Discard all tabs except the current one"
    }
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "TabFreezer",
    "default_popup": "popup.html"
  },
  "default_locale": "en"
}