SharePoint Quicklinks is a Chrome extension that provides a convenient way to access useful URLs on a SharePoint online site. The extension displays quick links to commonly used SharePoint features such as site contents, site settings, and site permissions, saving users time and effort by reducing the need for multiple clicks.

In addition to the pre-defined quick links, users can also store their own URLs for easy access. The extension supports placeholders such as {webappurl}, {weburl}, and {pageurl}, which are dynamically replaced with the corresponding URLs when enabled. However, it's worth noting that the links are only displayed if they have been enabled by the user.

As a SharePoint developer, I find this extension particularly useful for SPFx development. It allows me to easily test SPFx WebParts on the current page by appending the `loadSPFx=true` URL parameter. Furthermore, it provides the option to load an SPFx Application Customizer by requesting the App Id through a prompt dialog.

Overall, SharePoint Quicklinks is a handy tool for SharePoint users and developers alike, offering quick access to frequently used URLs and enhancing productivity.