Is Nightly Tester Tools safe?

Copies or inserts Firefox build and extension details for testing and troubleshooting workflows.

This extension adds toolbar and context menu options to copy the browser build ID or a list of installed extensions to the clipboard, or insert that information into text boxes. It also provides an option to customize the browser title bar, and stores extension settings. Its permissions allow access to extension management information, tabs, menus, clipboard writing, storage, and pages across all URLs for its insertion features.