2 pane Bookmarks color

[BobPM]

Hi,

I am migrating from Waterfox Classic to Palemoon.
On Waterfox, the directories are shown in a nice yellow color, while on Palemoon there are a dull grey.
How can I change this color?

Edit: that was the theme I was using, going back to Default gave the yellow back.
But the background is too dark for my taste.
I need a user friendly theme editor, any suggestions?

Edit 2:

Unfortunately, cloudflare prevents me from accessing some needed sites, and another post on this forum says that there is nothing to do about it.
Unless the problem has been solved since this post, I have to abandon Palemoon, after spending much time to configure it.
Let me know if there is a solution...

Thanks.