The Mullvad Browser is a privacy-focused web browser developed in collaboration with Mullvad VPN and the Tor Project. It aims to eliminate data collection and provide user-centric browsing services, ensuring online activity remains private and secure. The browser has the same fingerprinting protection as the Tor Browser, but connects to the internet without Tor Network or VPN instead. The Mullvad Browser provides anti-fingerprinting protections.
The idea is to provide one more alternative – beside the Tor Network – to browse the internet with more privacy. To get as many people as possible to fight the big data gathering of today. To free the internet from mass surveillance.
Here: >> mullvad browser official <<
Okay nothing new, nothing about the actual bubblewrap sandbox afais.
Yes they often have bad permissions, but thats because otherwise they would break.
The process is converting standard apps to Flatpaks, by actually implementing PORTALS. Portals are a special file manager that can open files outside the sandbox and symlink it to the flatpaks internal storage. So you can grant access only to needed files.