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.
Tha sinn duilich an naidheachd seo a chluinntinn. Mas e uidheam a bha ann anns nach robh earbsa agad, bu chòir dhut facal-faire a’ chunntais Firefox agad atharrachadh agus gach facal-faire a shàbhail thu ann am Fireox atharrachadh.