Hi

Do you have several add-ons installed in Firefox?

Thanks for the reply, I only got one add-on installed nothing more.

Hello, close other applications. Having many applications running simultaneously may cause your computer to run slowly and other applications to do so as well. By closing down some of the unnecessary applications, system usage will be reduced.

Check Firefox hardware acceleration. Firefox hardware acceleration eases memory and CPU usage in many cases. Check in Firefox's performance settings that hardware acceleration is turned on. Also make sure that your graphics drivers are up-to-date.

If none of the above options solved your problem, go to the following link Firefox uses too much memory or CPU resources - How to fix and carry out the procedures described there, contact us if you have any questions.