bug#69537: Remaining Firefox logos

[paculino via bug-gnuzilla via GNUzilla bug reports]

Hello, I was trying to debug an addon that stopped working recently (it is not 
an issue with icecat) and discovered that two firefox logos remain in the 
built-in page about:debugging#/runtime/this-icecat in 115.8.0esr (installed 
from Chippy's prebuilt .deb if it matters). One appears to be the logo for the 
dev/nightly version, and the other is a simplified/high contrast one, but it 
seems that both are mistakenly remaining. I have the image uploaded (for a few 
months at least) at 
https://files.p7.co.nz:5281/upload/LuvK7gt4R9XKzs2U/03da8999-8c9a-47cf-92a1-81ffe6a4cdc9.png