Hello,

In order to better assist you with your issue please provide us with a screenshot. If you need help to create a screenshot, please see How do I create a screenshot of my problem?

Once you've done this, attach the saved screenshot file to your forum post by clicking the Browse... button below the Post your reply box. This will help us to visualize the problem.

Thank you!

Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and

• Remove Cookies
  Warning ! ! This will log you out of sites you're logged in to.

Type about:preferences<Enter> in the address bar.

• Cookies; Select Privacy. Under History, select Firefox will Use Custom Settings. Press the button on the right side called Show Cookies. Use the search bar to look for the site. Note; There may be more than one entry. Remove All of them.
• Cache; Select Advanced > Network. Across from Cached Web Content, Press Clear Now.

If there is still a problem, Start Firefox in Safe Mode {web link} While you are in safe mode;

Type about:preferences#advanced<Enter> in the address bar.

Under Advanced, Select General. Look for and turn off Use Hardware Acceleration.

Poke around safe web sites. Are there any problems?

Then restart.

FredMcD said

Hello, In order to better assist you with your issue please provide us with a screenshot. If you need help to create a screenshot, please see How do I create a screenshot of my problem?

Sorry! I thought I had uploaded a screenshot, but it didn't work. Let me try again.

YouTube uses image "sprites" for various of its buttons. For example, when I inspect the page, it is using this one (I'm logged out, in case that makes any difference):

https://s.ytimg.com/yts/imgbin/www-hitchhiker-2x-vflzIV6yE.png

If you follow that link, do you get a block of little icons?

Are you running Firefox in Private Browsing mode?

Firefox 42+ has a new Tracking Protection feature that is enabled by default in Private Browsing mode. You can see a shield icon at the left end of the location/address bar when you are in private browsing mode that some content is blocked. You can disable this feature in "Options/Preferences > Privacy".

• Options/Preferences > Privacy: "Use Tracking Protection in Private Windows"

• https://support.mozilla.org/kb/tracking-protection-firefox
• https://support.mozilla.org/kb/control-center-site-privacy-and-security-firefox

If you use extensions (Firefox menu button/Tools > Add-ons > Extensions) that can block content (e.g. Adblock Plus, NoScript, Flash Block, Ghostery) then make sure that such extensions aren't blocking content.

You can try these steps in case of issues with web pages:

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)

Clear the cache and remove cookies only from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"

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

• Switch to the DEFAULT theme: Firefox menu button/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

jscher2000 said

YouTube uses image "sprites" for various of its buttons. For example, when I inspect the page, it is using this one (I'm logged out, in case that makes any difference): https://s.ytimg.com/yts/imgbin/www-hitchhiker-2x-vflzIV6yE.png If you follow that link, do you get a block of little icons?

Thank you! Yes, I do see a single .png showing many little various icons.

Hi Levicus, that's good, so that server is not blocked completely.

But why aren't the images showing on the page? They are displayed as background images, which is different from how the red icons on the left are displayed; those are inline images. One reason that background images might not show is if Firefox is overriding the colors selected by the website. It would be strange if this only happens on one site, but you can check that setting here just in case:

"3-bar" menu button (or Tools menu) > Options > Content

Click the "Colors" button, then check the selector below "Override the colors specified by the page with my selections above." Try "Never" and see whether that makes any difference. (Example screen shot attached)

That is a good idea! However, it doesn't seem to have done the trick. The fact that accessing the site via a proxy allows the images to load makes me think that somehow their addresses are being blocked. I tried disabling my firewall, but that didn't help. I would almost wonder if my ISP is somehow causing it, but other browsers don't have the same problem.

It's really hard to think of an explanation for why you can view the image "stand alone" in a tab but not as a background image, if Firefox is following the site's color scheme. Did you try the Firefox "Safe Mode" test?

That is a good question. Yes, I thought it was a conflict with some extension or addon at first, so I did test it in safe mode. I also tried resetting the browser fully. Neither seemed to rectify the problem, unfortunately! It's odd enough I almost suspected some strange, very specific malware problem, but scans have not revealed anything amiss.

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

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

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

You can check the Net log and the Network log in the Web Console (Firefox/Tools > Web Developer) to see if content fails to load or possibly is blocked (file size is zero).

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

Use Ctrl+F5 or Ctrl+Shift+R to reload the page and bypass the cache to generate a fresh log.