Installed the theme by following the instructions and the text in the omnibar does not appear as shown below:

I thought it might be an issue with the font not rendering so I changed the font from JetBrains Mono to Ubuntu Mono which is the default font in the my system and it still doesn't work.
What is the issue and how could this be solved?
EDIT: I'm using Firefox V122.0 on Ubuntu 22.04
Installed the theme by following the instructions and the text in the omnibar does not appear as shown below:
I thought it might be an issue with the font not rendering so I changed the font from JetBrains Mono to Ubuntu Mono which is the default font in the my system and it still doesn't work.
What is the issue and how could this be solved?
EDIT: I'm using Firefox V122.0 on Ubuntu 22.04