Hello,

Can you please confirm what you are seeing on the page? Doesn't the list of courses not show up or do you not see the videos of the course not load. A screenshot could be helpful.

Thank you

This is what I get when i go to courses. In windows too i had the same problem but upon upgrading it was resolved. I couldn't find the check for updates in About firefox menu.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/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

Clear the cache and cookies only from websites that cause problems.

"Clear the Cache":

• Firefox/Edit > Preferences > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Edit > Preferences > Privacy > Cookies: "Show Cookies"

Can you please update Firefox to the latest version. On Linux the upgrade doesn't happen via the Firefox (checking for updates), rather using your package manager. So, if you are using Scientific Linux, then please check the instructions on how you could get the latest version of Firefox and then try this.

Please let us know if that helps or not, so that we are able to check what else can be done to help solve the issue.