Missing scroll arrows in FireFox

[Executioner]

This is driving me nuts...Firefox does not have vertical scroll arrows on the top and bottom. I've started to use Chrome instead which does have the vertical bar with the scroll arrows at the top and bottom. I found this info while googling:
http://www.linuxquestions.org/questions ... 175580868/

How do I go about editing that file since it's read only? I also would like to make a copy of it in case I screw up.

[Executioner]

After more searching, I learned that I can use a 2 finger drag on the mouse pad.

[Schultz]

You need to open the file as administrator. If you're using the Mate DE, right click the file and select "Open as administrator." To backup the file before editing it, just copy-and-paste it somewhere else.

You should always give the version of Mint you're using and which DE (Cinnamon, Mate, KDE, or Xfce).

[Schultz]

I just tried this, and it works with no (so far) adverse effects! Thanks for posting the link.

EDIT:
I tested it first in Pale Moon, my default browser, and it works there, but for some reason it doesn't work in Firefox. Anyone know why it would work in Pale Moon but not Firefox? It worked 2 years ago in Firefox according to the link.

[Schultz]

Okay, I found the solution. Starting with version 46, Firefox is a gtk3 program. So if you are using FF 46 or newer (you should be using the newest version anyway) you will need to edit a different file. See this link:

http://www.linuxquestions.org/questions ... 175585064/

[Cosmo.]

If you want to scroll in FF (since 46) side by side with the scroo-bar you can use one of 2 methods:
Either click in the scroll-bar with the right mouse button, or click there by holding the shift key.

[sbroccolo]

I've taken the info from the referenced threads, tested it, and add a tutorial -
How to "scroll buttons" or "scroll arrows to Office and Firefox
viewtopic.php?f=42&t=251022