Mozilla announced the addition of persistent private browsing in the Firefox web browser for iOS which will allow users to stay in Private Browsing mode at all times. The new Firefox for iOS 15.0 build adds an extra feature to the private browsing mode, preserving private tabs when exiting the application and allowing users to continue their browsing session from where they left off. New organization options for the New Tabs feature make it possible for users to “choose to have new tabs open with your bookmark list
Source: security