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Done it. This pb doesn't appear with brave and Chromium.
I encountered this pb using admin profile in UNA, with firefox snap for ubuntu (133.0.3 (64 bits))
Note : I cleaned the cache and Ads icon still not showed, only text but Ads script blocking during the validation of the selected "new ad" category. (Icon appears less than 0,5 sec and disappear :
If I use a private windows from this firefox version the page appears correctly and creating an ad is working well with this admin profile.