Mozilla has released a major update to its Firefox browser, version 151, which includes several key enhancements aimed at improving user privacy and experience. A notable feature is the improved tracking protection, which limits the data websites can collect about users through fingerprinting techniques. The browser now includes an updated PDF viewer that allows users to merge multiple documents, making it more versatile for managing files. Additionally, the integrated VPN service now offers users the option to select specific countries for their data traffic, enhancing privacy further. The start page has also received a visual makeover, allowing users to customize their backgrounds with personal images. This update aims to set the stage for future widgets and quick-access features expected in version 152. Another practical improvement is the ability to instantly delete all data from a private browsing session without closing the window, providing users with more control over their browsing habits. Users can check for the latest version and update their browser through the settings menu.