Retry attach images.

Hi, it's possible that Adblock Plus is interfering, so try disabling it (Ctrl+Shift+A) > Extensions.

If that doesn't help, try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.

You will need to restart Firefox for this to take effect so save all work first (e.g., mail you are composing, online documents you're editing, etc.).

Then perform these steps:

1. Click the menu button and select Options on Windows or Preferences on Mac or Linux.
2. Select the Advanced panel and then the General tab.
3. Uncheck Use hardware acceleration when available.
4. Restart Firefox and see if the problems persist.

Did this fix your problems? Please report back to us!

If the problem is resolved, you should check for updates for your graphics driver by following the steps mentioned in these Knowledge base articles:

• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

• Upgrade your graphics drivers to use hardware acceleration and WebGL

Thank you.

Disabling Adblock did not change the symptom. Unchecking Use hardware acceleration when available had no effect. This is a new Windows 10 installation that claims everything is up to date. Hardware is an ASUS Q55 notebook.

See also:

• [/questions/1105189] why is firefox using Celsius instead of Fahrenheit on weather sites?

Forget About This Site did the trick. It's working now. From the other thread: You can remove all data stored in Firefox from a specific domain (website) via "Forget About This Site" in the right-click context menu of an history item ("History > Show All History" or "View > Sidebar > History").