Do you have any add-ons installed?

If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block (wanted) content (e.g. Adblock Plus, NoScript, Ghostery, uBlock Origin) always make sure such extensions do not block (wanted) content.

• make sure your extensions and filters are updated to the latest version

If images are missing then check that you do not block images from some domains.

• you can tap the Alt key or press the F10 key to show the hidden Menu Bar temporarily

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 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

You can check these preferences on the about:config page and make sure they have the default value.

• permissions.default.image (1)
• network.http.sendRefererHeader (2)

There is Tracking Protection that can block (wanted) content, so check the location/address bar for special icons.

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

If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block (wanted) content (e.g. Adblock Plus, NoScript, Ghostery, uBlock Origin) always make sure such extensions do not block (wanted) content.

• make sure your extensions and filters are updated to the latest version

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

See also:

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

Only default addons installed. (See screenshot)

Some different themes installed, but only Default is enabled. NONE of the themes work.

As you can see from the screenshots, images do not display on the Firefox pages, but display on "regular" pages.

Adblock Plus is disabled/uninstalled, due to refresh of Firefox, which did not restore themes/images.

re: '"You can check these preferences on the about:config page and make sure they have the default value."

   permissions.default.image (1)
   network.http.sendRefererHeader (2) '

YES both of these settings are correct.

bidness44 said

images not displaying, themes not working...even preview pix on themes page not displaying. was working yesterday. https://addons.mozilla.org/en-US/firefox/themes/?src=firefox latest version firefox, refresh done, rebooted, etc etc etc. Firefox version: 57.0 Operating system: Windows 7 Installed plugins: * Shockwave Flash 28.0 r0 STILL NOT WORKING.

Just tried it and have no issue loading and seeing the themes and this is with 3 Addons installed. Giving screen shot of other sites won't help since that won't show the problem correctly. Left most of my FF default.

Can you show a screenshot of a page where images are missing?

Did you check "Tools -> Page Info -> Media" on such a web page to see if Firefox recognizes that there are images?

Did you check the Web Console for error messages about blocked content?

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