Is my prayer valid, knowing that I performed ablution (Wudu'), and brown blood came out of my ear, then I performed ablution again and prayed while the brown color was still present?

If you prayed while menstruating due to ignorance or forgetfulness, your prayer is valid. However, if you prayed intentionally with blood exceeding the excusable amount, your prayer is invalid. You should have waited for the bleeding to stop to purify yourself, unless you feared the prayer time would expire, in which case you should pray in your condition, and your prayer is valid. Ablution is not invalidated by blood exiting the body, according to the preponderant opinion.