The latter is responsible for syncing bookmarks, extensions, history, settings, and more across signed-in devices running the first-party browser. “Some” Chromium browsers today can leverage features and APIs that are “only intended for Google’s use.” This includes Click to Call and, notably, Chrome Sync. Google recently discovered that users of third-party Chromium browsers have inadvertently been able to access data and other sync features reserved for Chrome. Besides the intended differences, web browsers based on Chromium offer an underlying experience that’s mostly identical to Chrome.