Content auditing
When you switch to the Update tab and select a URL field, a matching record opens for editing as you browse the web and transition from URL to URL.
Even if the content is not directly stored in Airtable you can have a designated record for each page which stores useful metadata for management.
Maybe you have a blog and you want to manage the creation and editing for each page.
Or you have a documentation system and as you browse around, you want to quickly save notes about what to update or change and track if the documentation is still up to date with the product itself.