mullvad browser always wants to open thunar by default

mullvad browser always wants to open thunar by default after a file is downloaded when opening a directory using the button under the downloads button, even if the default file browser is something else like dolphin in a gnome-based desktop (but thunar is also installed)

when opening a directory, first thunar asks to use the internet and then when denied, it take a long time, sometimes minutes, to open. the expected behavior would be for the default file browser to open

The current workaround is to not open the directory through the button that shows the downloaded files and instead go into Dolphin and go to the directory manually, wasting time

THIS PROBLEM DOES NOT HAPPEN WITH TOR BROWSER, ONLY MULLVAD BROWSER. Tor browser opens the default file browser when this button is pressed.