Both browsers are relatively equal in terms of data encryption. However, if online privacy and transparency are important to you, then Firefox is clearly a better choice here.
Iminigen i sin meḥsub mgadan deg wayen yerzan awgelhen n yisefka. D acu kan, mayella tabaḍnit d tefrawant deg uẓeṭṭa sɛant azal ɣur-k, ihi iban d Firefox i d afran igerrzen da.