Solution for Firefox crashes after update v 61

Hi all,
For those who updated Firefox Mozilla browser to v 61. And they find that this update crashes every time they lunch it.

// the crash report
FramePoisonSize: 4096
InstallTime: 1531589794
Notes: Ubuntu 14.04.5 LTS
ProductID: {ec8030f7-c20a-464f-9b0e-13a3a9e97384}
ProductName: Firefox
ReleaseChannel: release
SafeMode: 0
SecondsSinceLastCrash: 62805
StartupCrash: 1
StartupTime: 1531679236
ThreadIdNameMapping: 4569:"Gecko_IOThread",4570:"Timer",4571:"Link Monitor",4572:"Socket Thread",4573:"JS Watchdog",4580:"BGReadURLs",4581:"Hang Monitor",
Throttleable: 1
UptimeTS: .6212477
Vendor: Mozilla
Version: 61.0.1
This report also contains technical information about the state of the application when it crashed.

They can downgrade to v 57.0.4 using these instructions:
First delete Mozilla

sudo apt-get purge firefox
sudo rm /usr/bin/firefox

Then execute these command lines

sudo dpkg -i firefox_57.0.4+build1-0ubuntu0.14.04.1_armhf.deb
echo 'user_pref("", "");' >> ~/.mozilla/firefox/*.default/prefs.js

You can stop software updater from suggesting to update Firefox using this command:

sudo apt-mark hold firefox firefox-locale-en

change ‘hold’ with ‘unhlod’ to restore updates

Great! Thanks for sharing!

You are welcome kayccc