Germanium Selector Builder is a Chrome add-on that allows developers to easily generate XPath/CSS Selenium/Germanium selectors with just a click of a button. It is available as a panel in the developer tools, specifically in the Germanium SB panel.

Using this tool, developers can pick elements on a webpage and generate selectors that can be used in Selenium tests. Each time an element is picked, a selector is generated and added to the editor. The type of selector (CSS or XPath) is automatically identified based on the selection made.

Once the editor is opened and elements are picked, more selectors are added to the editor. By pressing the "Blink" button with the cursor on top of the editor, developers can see the matches for the selector in the browser's console. In the pro version, the matched elements also blink on the page.