Sometimes you'll either be too busy or focused on the task at hand to remember to "Semantify" pages. No problem. SemantiFind can automatically Semantify and catalog pages for you.
When it determines that you've shown sufficient interest in a page, and when it has a set of defined labels to use, it will automatically add pages to your catalog. The sensitivity with which it does this is selectable. Under the Options menu in the SemantiFind toolbar, you'll find an item called 'Settings'.
From here you can control the auto-Semantify sensitivity and whether or not you need to have shown activity on the page by scrolling the page before it will be automatically "Semantified". Auto-semantify is actually quite a bit smarter than this in how it determines whether you're interested in a page but this gives you some rough control, including the ability to turn this feature completely off.