If I'm not wrong, the version before the Chrome codebase and Firefox were merged, did update the icon color/name to reflect the proxy used for the page's URL
It appears that is no longer the case.. Also, there's no indicator for the Set Tab proxy function. This could help it

Firefox v121.0
FoxyProxy v8.8 (22 Dec, 2023)

Edit: I check for duplicates but couldn't find any, please do close this in that case