User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
Firefox/60.0
Build Identifier: 

I'm using Leap 15.1 within VirtualBox.

After installing (sorry, patches from November)

MozillaFirefox-branding-upstream MozillaFirefox-buildsymbols
MozillaFirefox-devel MozillaFirefox-translations-other

the clipboard (KDE Plasma 5.12.8) between the Leap-VM and the Host doesn't work
anymore (not only using Firefox, always!, e.g. take a snapshot) I only can
copy/paste plane text.

It does neither depend on VirtualBox Version (5.16 ... current) nor on Host-OS
(W7 or W10)

Current I locked this patches with zypper

Reproducible: Always