you have to wait for some more time . many users facing this problem. firefox is going to give an update for all ff os phones .

Hello,

Thank you for contacting Mozilla. I understand that you are having problems with your phone crashing. In order to better understand and investigate on the issue that you are encountering, please reply to this message with the following information:

• What is the model of your phone?
• What is the OS version found in the Device Information page? Please visit this link if you need help finding the Build ID of your phone.
• Please provide the exact steps to reproduce the issue you are encountering.
• Who is your current cell phone carrier?
• How often do you encounter this issue?

Please be sure to include as much detail as possible, including any websites that may exhibit this issue, and any error messages that you may be receiving, exactly as they appear. This will ensure that we will have all the information needed to investigate into this. Thank you for your help and we look forward to hearing from you!