ANSWER:

No problem in cracking fingers.  You should not do this while praying salah. 

My question is that is it not allowed to crack fingers.i mean sometime due to pain I crack my finger but my mom says we shouldn’t coz it’s not allowed in islam.is it true???

Halal/Haram Matters, Innovations, Prayer | October 5, 2019 8:39 am
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Some days directly after fajr I see people at my local mosque praying another salat. Even if the time for fajr hasn’t elapsed can they still do this? I was always told we can’t pray after we pray Fajr.