Which feature allows users to apply specific settings in a browser?

The feature that allows users to apply specific settings in a browser is related to the concept of the user interface (UI), which encompasses how users interact with the browser and navigate its features. A well-designed UI enables users to customize their settings effectively, including privacy controls, appearance, and accessibility options, contributing to a personalized browsing experience.

While options related to the backend or browser components may play roles in how browsers function, they do not directly address user control over settings. For instance, the UI backend would handle functionality behind the scenes, but it is ultimately the user interface that presents these options to the user. A well-functioning rendering engine focuses on displaying web pages accurately and efficiently, but it does not deal with user settings. Session management relates to maintaining user sessions and managing data over browsing sessions, rather than providing a direct interface for users to apply specific settings.

The ability to modify settings is fundamentally grounded in the user interface, making that the correct focus for this question.