#Testcase_01
I successfully added themes, but Firefox 128 just picky as the latest I tried on Windows last time. It was about theme release versions.
Nervermind. One of my favourite Kill Bill theme worked, but install addition button caused crash and restart - it finally added.
Seems that part would restart Firefox to activate it nott without issues,
as it just happened meanwhile
#Testcase_02
installing uBlock Origin as well. Clicking on [Add] button crashed Nightly,
but when it restarted the familiar uBlock icon has sat on the usual place on browser window. Using it
#Testcase_03
I could simply switch on
*Menubar
- Favorites bar
Yupppppee ! 
#Testcase_04
Just as basicks happened happily … to the delight of this … I launched one of my google mail account to get in -
but it had surprisingly failed due to input field regression.
Nor Cut&paste had not worked at all
neither typing had not enabled tpo me to type ‘@’ which is [AltGr + V] on Hungarian layout.
The ‘AltGr’ was simply ignored, so just a ‘v’ was written in the field.
As C&P had not worked – I could not use it as a workaround.
Now I’m tired from typing in this positure… I let forum stuff leave and further tests for tomorrow afternoon.
(My butt, spine and upper right arm needs rest.)