After a freeze of the topbar, this solved the problem :

sudo rm -rvf ~/Library/Application\ Support/Firefox/ ~/Library/Caches/Firefox ~/Library/Preferences/org.mozilla.firefox.plist

The sync feature is great btw 😃

Reusable svg shapes

30 000 bugs par mois 😱
(via bortzmeyer sur Mastodon)

The fox say HEHEHEHEHE !
Mystery solved