Examine source code of Batch Kill Tabs

{
  "manifest_version": 2,
  "name": "Batch Kill Tabs",
  "version": "1.0.0",
  "description": "Kill processes of all open tabs to free RAM without closing them. Uses Firefox's native tab discard API to unload tab content from memory.",
  "icons": {
    "48": "icons/icon-48.svg",
    "96": "icons/icon-96.svg"
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@batch-kill-tabs",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.svg"
    },
    "default_title": "Batch Kill Tabs",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "discard-all-tabs": {
      "suggested_key": {
        "default": "Ctrl+Alt+K"
      },
      "description": "Discard all inactive tabs to free memory"
    },
    "discard-all": {
      "suggested_key": {
        "default": "Shift+Alt+K"
      },
      "description": "Discard all inactive tabs to free memory"
    }
  }
}