Make flyingFox compatible with VivaldiFox extension

**Describe the bug**
Make the top bar respond to vivaldi fox extension color changes

**To Reproduce**
Download vivaldifox extension

**Screenshots**
![image](https://github.com/user-attachments/assets/bd3c527c-e44b-4375-b6b3-3db4fb7c3451)


 **Firefox Version:**
128.0.2