Hello m.aristia.
Thank you for using Apple Support Communities and for sharing these details with us. It sounds like you're experiencing issues when using a third-party web browser. Specifically, your web browser stops responding and unexpectedly closes on you. If this is the case, we'd like to look into this issue with you.
You can try to test this issue in safe mode and also test this issue with a new user account on your Mac. Safe mode does a great job in stoping non-essential apps from opening while starting up your Mac. These steps are a great way to further isolate issues that might arise. Check out the links below:
How to use safe mode on your Mac
Set up users, guests, and groups on Mac
If these steps don't help, you'll want to reach out to the app developers for assistance. You've already done a great job in troubleshooting this issue. They would be the best suited to assist you further. For steps on how to reach an app developer, use the link below:
How to contact an app developer
Thank you for using Apple Support Communities.