Here are some screenshots to help as well. There is an image of what the signature is supposed to look like. I could see it like this after I originally uploaded it, and I can see it like this after I post a picture into an actual post. Then like I said, as soon as I refresh the page or move to a different one the image will disappear to be replaced by a large white space where the image is supposed to be. Recently though, I've had a little broken image icon appear in the top left corner. The signature continues to work fine on my phone and when using other browser, so I know there's nothing wrong with the signature code or image itself.

Is the address of the signature on the same server as the page, or on a different server? This would be the part between the first two // and the next one.

Does it make any difference if you bypass Firefox's cache? Use Ctrl+Shift+r to force a full reload of the page fresh from the server.

Although a Reset removes most of your extensions, the ones installed by other software on your computer carry over. Could you try the page in Firefox's Safe Mode? That's a standard diagnostic tool to bypass interference by extensions (and some custom settings). More info: Diagnose Firefox issues using Troubleshoot Mode.

You can restart Firefox in Safe Mode using

Help > Restart with Add-ons Disabled

In the dialog, click "Start in Safe Mode" (not Reset)

Any difference?

I'm afraid I'm a little confused at your first section. The image is hosted by Photobucket, and I shortened the image code using TinyURL because otherwise the code wouldn't fit into the Sims 3 website's signature character limit. Is that what you meant?

I tried the other two options, and neither worked. All I saw was the same broken image icon where the signature should be. (And for whatever reason, when I went to "Help > Restart with Add-ons Disabled..." I did not get a "Start in Safe Mode" option. All I got was "Reset" and "Cancel." I had to start Safe Mode by holding Shift while reopening Firefox.)

When viewing a page that has this problem, do you notice any unusual icons to the left of the address? By unusual I mean, other than the globe or padlock. If you see anything different there, go ahead and click on it for more information.

Could you provide a link to one of the pages that has this problem?

Nope. Nothing unusual.

This will take you to the post in the forums where I first asked if the other users could see the signature that I wasn't able to view. They all said yes. I'm the user iButterfree.

There have been issues reported in Firefox with images stored on Photobucket.
Easiest would be to host the images with another image hosting company.

This issue seems to be caused by Firefox sending the default text/html accept header instead of an image request and this causes Photobucket to redirect to an HTML page with the image and not the image that is requested.

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It seems using Photobucket was the issue. It's working perfectly fine now. Thank you both jscher2000 and cor-el.