We're sorry to hear about this. If this was a device you really don't trust, you should change your Firefox Account password, and change any passwords saved in Firefox.
Ɗum deh welaani nande. So ɗum ko kaɓirgol ngol a hoolaaki e jaati, pot-ɗaa ko waylude finnde maa Konte Firefox, e finndeeji danndaaɗi e Firefox fof.