Doesn't work anymore on fanbox

[markusmatterhorn-cpu]

Describe the bug
The addon doesn't work anymore on pixiv fanbox; the toolkit symbol on the addon taskbar is still blue instead of grey, indicating that it recognizes the site, but the pull-up arrow that lets me download doesn't appear; still works normally on regular pixiv;

Example work from Pixiv
The issue affects fanbox in general;

Screenshots
Added

Browser and Version (please complete the following information):
Firefox 135

Settings of extension
Added

pixiv_toolkit_settings-1784051710382.json

[DosonChan]

6.4.2 same on Edge 149.0.4022.98

[andyboji]

Same issue on Chrome 150.0.7871.125