What kind of functionality can browser extensions typically provide?

Browser extensions are small software programs that enhance the functionality of web browsers. They serve to extend the browser's capabilities by adding new features or improving existing ones. These extensions can perform a variety of tasks, from blocking advertisements and managing passwords to integrating with other web services and enhancing privacy.

For example, a browser extension might allow for easier bookmarking of web pages, integration with productivity tools, or customization of the user interface. Because they operate within the browser environment, extensions can enrich the user experience by providing additional features that are not natively found within the browser itself.

In contrast, advanced video editing typically requires dedicated software that operates independently of a browser; increasing hard drive storage is irrelevant within the context of browser functionality; and while some extensions may help with spam filtering by blocking unwanted content on the web, this is just one specific application of what browser extensions can do. Thus, extending the browser's capabilities is the fundamental purpose of these enhancements.