In the name of Allah the Most Beneficent Most Merciful,
Kissing the Mushaf if it falls by the Sheikh Saalih al-Fouzaan -may Allah preserve him- [Reference below]
Question: May Allah give you good possessor of excellence, the Questioner asks: Some people when they drop the Mushaf they kiss it (after picking it up), so what is the ruling concerning that with mentioning the proof?
Answer: There is no proof for that, kissing the Mushaf has no proof for it. So if he/she drops the Mushaf then let him grab it and pick it up and this is sufficient and all praise is due to Allah without (him) kissing it.