Quick addendum:
After trying to install the Quicksilver Browser Demo in my lunch break, the device didn't start new applications anymore. Boot freezes at the "jolla/intel" screen. I can not recommend trying Quicksilver at this point – the developer does not recommend it as well. I might have to try to flash the device this weekend. I don't like flashing stuff.
Oh well, that's what you get for trying stuff before thinking.