Is it permissible to consider the yellowish and brownish discharges from the vagina as pure after the regular menstrual period, despite previous fatwas describing them as impure, in order to facilitate and alleviate hardship in performing prayers?

The yellowish and brownish discharges are not considered part of the vaginal secretions, but rather they are impure (najis) substances. It is obligatory to guard against them and to purify anything that they stain on clothing. Guarding against them with a cloth or similar item is easy. According to the preponderant opinion, it is not obligatory to renew this protection for every prayer.