See:

• http://kb.mozillazine.org/Images_or_animations_do_not_load

• Check the permissions for the domain in the current tab in Tools > Page Info > Permissions
• Check that images are enabled: Tools > Options > Content: [X] Load images automatically
• Check the exceptions in Tools > Options > Content: Load Images > Exceptions
• Check the "Tools > Page Info > Media" tab for blocked images (scroll through all the images)

There are also extensions (Tools > Add-ons > Extensions) that can block images.

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

I put all my permissions right, still doesn't work, seems to be the same problem as: viewtopic.php?f=30&t=2977

Did you check for extensions that can block the CAPTCHA ?

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode

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

If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.

• Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
• Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

I had the same problem and i have many extensions addons.So i disabled all of them and the Captcha problem was solved.The problem for me was with the HTTPS Everywhere extension... somehow it was blocking the captcha image.

Hope it helped.

Hello, I had the same problem with mine, I was using the Disconnect extension. I disabled it and now the captcha loads properly.