The audio and video settings have nothing to do with images. Can you see images listed in the page information dialog? (ctl+i, media tab)

You could try Troubleshoot Mode and also troubleshoot addons. https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

No luck with your suggestions, but thanks. By the way "images" is not listed in the Media tab or as noted originally it's also not listed in the Permissions tab.

Resetting is a drastic step. I would try a new profile. Have you checked the media tab on more than one website? https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles

Aren't there any images listed in "Tools -> Page Info -> Media" on pages where there are images ?

You can check the Web Console (Tools -> Web Developer) for messages about blocked content and about the presence of mixed or unsafe content.

• https://developer.mozilla.org/en-US/docs/Tools/Web_Console

You can check the Network Monitor to see if content is blocked or otherwise fails to load.

• https://developer.mozilla.org/en-US/docs/Tools/Network_Monitor

If necessary use "Ctrl+F5" or "Ctrl+Shift+R" (Mac: Command+Shift+R) to reload the page and bypass the cache to generate a fresh log.