Created attachment 113818 [details] Scrollbar arrows in Firefox look pretty bad and are of no practical use Reasons: 1. The arrows are too tinny to serve a practical purpose 2. The arrows are off relative to the scrollbar Regards
Created attachment 113819 [details] Here's how it looks like without magnification
KDE Ne
In Kubuntu 18.04 the arrows are missing and it looks better that way.
Do these appear only in Firefox, or in all GTK apps? Do you have arrows turned on in System Settings > Application Style > Widget Style > Breeze > Configure... > Scrollbars?
*** This bug has been marked as a duplicate of bug 390625 ***
*** This bug has been marked as a duplicate of bug 396091 ***