The default Quick connect option will connect you to the fastest available server for you. This leads to better load balancing and higher speed, which is a priority for free users. If you'd like to connect to a specific server in a country of your choice, you may consider upgrading your plan.

That said, can you let us know what exactly doesn't work when connected to our free US and Poland servers? Contact us with more details by clicking on Help in the Proton VPN extension, then selecting 'Contact us' so we can assist you further.