Have you tried to reproduce the same steps by opening firefox in Safe mode ? Read more : http://mzl.la/1xKrE7R ? Also Turn off "Hardware Acceleration" by going Menu > Options > Advance > General > Uncheck Use hardware acceleration when available. Now exit and restart your firefox again and see if the problem solved.

See more : https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding

Well said, Chandan.

What are you using as your homepage?

FredMcD said

Well said, Chandan. What are you using as your homepage?

Hello FreD, It changes periodically :) However Currently using google as a homepage.

Chandan_Baba said

Have you tried to reproduce the same steps by opening firefox in Safe mode ? Read more : http://mzl.la/1xKrE7R ? Also Turn off "Hardware Acceleration" by going Menu > Options > Advance > General > Uncheck Use hardware acceleration when available. Now exit and restart your firefox again and see if the problem solved. See more : https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding

i think this fixed my problem. i've tried restart my PC twice and when i run the firefox there is no freeze anymore. thank you sir

Hello,

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution more easily.

Thank you for contacting Mozilla Support.

No need to cross post about this unneeded software. https://support.mozilla.org/en-US/questions/1126850

edit: this post was a reply to a above post that was about a Firefox preloader that was marked as spam so it is hidden.

you can follow this link: https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding