Please reload the webpage while bypassing the cache using one of the following steps:

• Hold down the Shift key and click the Reload button with the left mouse key.

OR

• Press Ctrl + F5 or Ctrl + Shift + R (Windows and Linux)
• Press Command + Shift + R (Mac)

See if this helps solve the issues you had and please report back to us!

Try to disable hardware acceleration in Firefox.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

• https://hacks.mozilla.org/2010/09/hardware-acceleration/

iamjayakumars, that worked.

I've never heard of that solution. What does it do?

Is the fix permanent or will I have to do it each new time I open Twitter?

Thanks.

(cor-el, hardware acceleration was disabled, thanks.)

Its happen very rarely..
No need to do it everytime..

Genius. Thank you.