Mozilla has released a preview of its new Firefox browser for Android, built on the GeckoView engine, which promises faster performance and improved privacy features. The new browser is currently available for testing and is expected to be released in a feature-rich version later this year. The GeckoView engine allows for greater flexibility in terms of privacy and security features, and the browser includes features such as tracking protection and collections for organizing bookmarks. The current version of the browser does not support add-ons, but this is expected to be added in the future.