Thanks HoaS (again). It works now on an unfrozen system. Waiting for another freeze to see if it works then (I'm assuming it will).

After playing a handful of youtube videos on Chromium it hasn't crashed at all yet, unlike Vivaldi where I'd get crashes on just about every other video (and sometimes multiple crashes on the same video). FTR, Chromium did crash on me once, but there were no videos playing at the time.

So, I'm guessing there really isn't anything that can be done about this? I'd really prefer using Vivaldi over Chromium for youtube watching.

Thanks for the link HoaS. I run uBlock Origin in all my browsers . . . is the add-on you linked to still necessary?

Looked all through there. It doesn't look like Chromium has an option for a menu bar, which doesn't surprise me. 
Anyway, so far, no crashes on it; but haven't tested long enough yet to my satisfaction.

If the problem is indeed PM and Vivaldi are using their own libraries, then the first question that comes to my mind is then why didn't I experience so many crashes when I was running Devuan 2.1 (i.e., the Miyo version based on 2.1)?

Hi Miyo, I installed your new upload of Miyo and the bootup works great. But one problem I'm having is this: to fix the major screen tearing I get in my browser, I always edit the compton.conf file from this:

backend = "xrender";
#backend = "glx";

to this:

#backend = "xrender";
backend = "glx";

However for some reason, this time this file doesn't exist. What can I do? (Yes I deleted picon and installed compton. Was that a mistake?)

So then am I to assume that I really am on 3.1?

Once again, HoaS for the win! Thanks.

Thanks to all who answered. I have a question for using both Kelsoo's and HoaS's answer:

For Kelsoo's simple command: sleep 300 ; mplayer loud-song.ogg

is there a way to set it so that mplayer continues to play the sound file, until I tell it to stop?

For HoaS's script, same question.

There was one thing I wish I did before I reinstalled Modern. When the boot up process picked up after the message in the image above, the first line said something to the effect of "No longer waiting . . . ." I don't remember if it said what it was waiting for as the text would speed by very fast (I don't think it did). Does this offer any clues as to what could've been the problem?

No, I didn't get this error while I was running the unstable Miyo/Devuan 5. Version 5 uses the 5.15 kernel, I think. Honestly, I'm thinking of either going back to version 3 (Miyo Modern), or the unstable and make sure this time I'm running apt-listbugs.

On a side note, I want to thank you HoaS . . . you've helped me out a handful of times here on the forums. It is appreciated.