You are using a very old outdated program. https://support.mozilla.org/en-US/kb/update-firefox-latest-version '''41'''

Are you using a Firefox 38 ESR version? You can try to reinstall Firefox. *https://www.mozilla.org/en-US/firefox/organizations/all/ *https://www.mozilla.org/en-US/firefox/38.3.0/releasenotes/ *https://www.mozilla.org/en-US/firefox/organizations/system-requirements/ Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox menu button/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem. *Switch to the DEFAULT theme: Firefox menu button/Tools > Add-ons > Appearance *Do NOT click the Reset button on the Safe Mode start window *https://support.mozilla.org/kb/Safe+Mode *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes