Q4OS Trinity
I really worked hard on this, and hoped that I could do better than I have, but I've lost any interest in taking this exploration much farther.
Since I couldn't access my NAS with Konqueror, I configured Thunderbird with one email account and searched for an old email I sent myself containing the texts for the bashrcAdditions file (my macros for BASH) and my fstab additions that append my NAS shares to the /etc/fstab file.
Using the modified fstab, I was able to mount those shares to /mnt, and verify that they were indeed mounted by listing the contents of a few shares in the terminal using ls commands. But Konqueror couldn't access the NAS or its contents.
So, I used apt to install a copy of Dolphin, but all I could get from its Network location was an error telling me that no workgroups were found on the local network. So, it's obviously an earlier version of Samba than I'm used to seeing.
So I could access my NAS shares in the terminal, but that's like pulling teeth, compared with accessing them in a file manager.
I have no doubts that I could further install and configure Vivaldi, but I've been there and done that with the Plasma DE, and it's the same OS beneith the DEs.
CONCLUSION:
My impression of Q4OS is of a lovely and delightful OS that will appeal to lots of folks, but it's being held back by obsolete software on an old LTS kernel. If anyone reading this is inclined to give it a try, I recommend installing the Plasma version, but that may be because that's my daily-driver DE and I know it well.
Trinity may have gone just a bit too far in making a lightweight DE even lighter. After creating multiple virtual desktops, for example, I found out that there's no indication on the main desktop of what desktop you're on. No set of desktop icons in the panel, not even a number displayed to tell you which one you're on.
After a while, I found a way to assign an application to a certain desktop, and I could scroll through the desktops with the mouse wheel on the desktop background, but that's almost as clumsy than the GNOME DE.
If Q4OS could be brought into the present day, I think it could be a big hit. There's a lot that can be said in its favor. Please keep in mind that these are MY opinions, as someone who's been thoroughy spoiled by Solus. Your mileage may vary if you install Q4OS and give it a try for yourself.