Can you open this logo via the location/address bar?

• https://en.wikipedia.org/static/images/project-logos/enwiki.png

If images are missing then check that you do not block images from some domains. You can tap the Alt key or press F10 to show the Menu Bar Check the permissions for the domain in the currently selected tab in "Tools > Page Info > Permissions"

Check "Tools > Page Info > Media" for blocked images

• Select the first image link and use the cursor Down key to scroll through the list.
• If an image in the list is grayed and "Block Images from..." has a checkmark then remove this checkmark to unblock images from this domain.

Make sure that you do not block (third-party) images, the permissions.default.image pref on the about:config page should be 1.

See also:

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

There are extensions like Adblock Plus (Firefox/Tools > Add-ons > Extensions) and Anti-Virus security software that can block images and other content.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

See also:

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
• http://kb.mozillazine.org/Images_or_animations_do_not_load
• http://kb.mozillazine.org/Websites_look_wrong

If you use Avast then try to disable HTTPS scanning in Avast Web Shield.

• http://www.ghacks.net/2014/10/31/avasts-https-scanning-interferes-with-firefox-and-other-programs/

Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) to see if that has effect.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/

the link wont load at all, no 404 or error, just doesn't do anything when clicked. It looks like it's loading it for a second, but instantly stops. Nothing's blocked on Wikipedia, image loads just fine in IE.

looking through tools>Page Info>Media, I can find the image just fine, and it doesn't have any issue previewing it, doesn't seem to be blocked at all

Suddenly the link loads fine, no idea what I did different, maybe after I checked it with IE something changed?

but the icon in wikipedia's tabs is still missing, even after disabling avast's https scanning and running firefox in safe mode

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• Hold down the Shift key and left-click the Reload button
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Command + Shift + R" (Mac)

didn't work, after doing that the logo has disappeared again and wont load via the link

Did you make sure that security software isn't blocking this image?

What does the Network tab show if you open the image in a tab?

• https://developer.mozilla.org/Tools/Web_Console

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

• Switch to the DEFAULT theme: 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

Create a new profile as a test to check if your current profile is causing the problem.

See "Creating a profile":

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

After messing with my antivirus software and turning off web scanning completely, it looks like it's the problem afterall. I'll take it up with the avast forums, thanks for your time

Can you tell us what settings in Avast you needed to change?

It can help other with similar issues.

I had to turn off avast's web shield completely and shift+refresh wikipedia, not an optimal solution. A thread is already up on the avast forum full of similar issues, hopefully it will be resolved soon