Hi Adrian

Some websites have a lot of information and often heavy themes.

Did you try with another browser?

If there was a problem with other browsers as well as the problem of site.

Thanks For using FireFox.

this happens only on firefox..

Ok

Please Renistall Firefox and try Again my Freind

Maybe This Websites Have Some Elements That Not Supported By Firefox or they are crashed

You can try to disable OMTC and leave hardware acceleration in Firefox enabled.

• about:config page: layers.offmainthreadcomposition.enabled = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

You can try to disable hardware acceleration in Firefox.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"

You need to close and restart Firefox after toggling this setting.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
• https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

metal75 , i did that but no changes happened