Link extraction is a feature of our desktop app where the app will try to extract the first link found in the task description and displays a button on the task itself in the list to open the URL in your browser quickly.
This is useful, for example, when building reading lists using our browser bookmarklet.
This screenshot is from an older version of Lunatask. The app looks different these days, but the functionality of the feature showcased here is the same.
If you find this feature distracting, you can disable link extraction in the settings.