Question: What is the ruling regarding making a long supplication behind the maqaam Ibraaheem?

Response:
From the innovations that some people do when they stand behind the maqaam Ibraaheem is that they make a long supplication which they call "du'aa. al-maqaam". There is no basis for this from the Sunnah of the Messenger (sal-Allaahu `alayhe wa sallam). This is an innovation that is prohibited. Along with this being an innovation, every innovation is (a door to) misguidance, whereby some people hold (small) books which contain this supplication and they begin supplicating in a loud voice and those behind them respond by saying "Aameen". This is an innovation, and with this there is interference upon worshippers (in prayer) around the maqaam Ibraaheem. From that which has preceded, interference of worshippers (in prayer) is prohibited.

Shaykh Ibn 'Uthaymeen;
al-Bid'u wal-Muhdathaat wa maa laa Asla lahu - Page 399;
Fiqh al-'Ibaadaat - Page 356

Taken from fatwa-online.com