"Technically, yes! You're right that Nightly versions are unstable and may contain bugs, but they are not necessarily applications to discard. In a very tight nutshell, you should keep this in mind: standard versions are for regular users, for those who simply want to browse the internet and nothing more. Nightly versions are advanced developments, aimed at developers or those who want to preview features that will later be implemented in the stable version!
I’ve been using Firefox Nightly for years without any issues.
If you want, you can try it and give feedback to Babo for his userscript.
Hey man, it worked apparently. Thank you for the suggestion +1.
As for the feedback, the site is very slow, I have no idea what caused this, whether is was the script or my wifi connection. And regarding the resizing there are some issues! I am positive of this! I just can't explain the situation. You have to test it yourself...
@babo, was it originally intended to look this way? The username, profile photo taking all the space here. I tried to zoom out, but it was at it's max limit!

No, my friend, that should be a Firefox display setting issue.
It probably resizes the text automatically to fit the page.
Take a look in the accessibility settings, it should be there!
I don’t use Babo’s userscript because I use a tablet when I’m out, so I don’t need the userscript.
It could still be that the userscript and the accessibility settings conflict with each other.
You’ll have to tinker a bit in that case.