In case you didn't already see it when submitting your question, there's a general help article called "[[Fix problems that cause images to not show]]" which might be useful. Google uses something called a data-URI for the thumbnails on Google image search. These are images encoded into a long gibberish-looking string of text that start with: data:image/jpeg;base64 ... So Firefox's permission system that can block images from certain sites shouldn't be blocking them. Possibly an add-on could do it? '''Testing in Firefox's Safe Mode:''' In its Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, and some other advanced features to help you assess whether these are causing the problem. ''If Firefox is not running:'' Hold down the Shift key when starting Firefox. (On Mac, hold down the option/alt key instead of the Shift key.) ''If Firefox is running:'' You can restart Firefox in Safe Mode using either: * "3-bar" menu button > "?" Help > Restart with Add-ons Disabled * (menu bar) Help menu > Restart with Add-ons Disabled and OK the restart. ''Both scenarios:'' A small dialog should appear. Click "Start in Safe Mode" (''not'' Refresh). Any improvement?