@nucerl , do not use VPN extensions, they are not efficient and also the free ones usually collect your data.
An extension VPN can only open a private tunnel after your browser has connected to the network, thus exposing your IP as well.
To avoid this, the VPN must create the private tunnel before you open the browser, that is, from the OS.
If you want free VPN, I only know 2 reliable free ones, Proton VPN. (has no data volume limit) and Windscribe (10 Gb / month), but both are limited in number of servers in their free versions.