Sign back into any device or service where you use your Firefox account and follow the steps that will be presented to you.
Ɛawed qqen ɣer yibenk neɣ ɣer tkebbanit anida i tseqdaceḍ amiḍan-ik/im Firefox syen ḍfer imecwaṛen ara ak(am)-d-yettunefken.