Thats usually from osteoarthritis.

There are a few reasons you have cracking and popping noises from your joints.....it doesn't necessarily mean there’s something wrong

https://health.clevelandclinic.org/snap-crackle...

I’ve had it since I was 16. I’ve found it’s the prelude to arthritis.

Cracking and popping in joints isn't necessarily related to fibro. It is more associated with joint damage.

I have it all over , mostly my chest , ankles , shoulders . But it gets really bad when my hip is inflamed like today , even raising my leg is giving a cracking sound . I’m scared . Not much can be done , just live through it .