what VERSION of Firefox? I see lots of complaints and nobody following the actual Troubleshooting steps except Jace M. I am having zero problems seeing everyone on my Firefox right now. Knowing that helps you absolutely zero though, as you have no idea what version I'm using, so even if you were able to revert, or update, you have zero idea which version to grab.58.0.2 (64-bit) is my version, and I am up-to-date as well. if you look in the About under Help in the Toolbar for Firefox, there is a built in updater located there by default that can check your current version and update it for you with the press of a button. Should you be inept for whatever reason (the opposite of adept & skilled) at locating the correct window, unless you managed to remap your Hotkeys somehow, the following [Key] Combination should take you to (((the) correct) window): (([Alt]+[H])[A])
That is [Alt] & [H] Key together,
then you release those and press the [A] Key,
the "About Firefox" Window that opens is the one you will want also, there's at least 2 sites you want to allow Images from, so, I'm assuming you are all on some form of Desktop/Laptop, go to the following sites, and, without highlighting anything, mouse over some blank space, Right Click, and press [I] (not [L]), this should open a permissions Window, where you can explicitly override the security settings to allow Images, amongst other things (Login Cookies, Webcam, Microphone, Auto-Switch Tab [eg: Character Sheets], etc.), the first one should be rather familiar: <a href="https://app.roll20.net/v2/images/roll20-logo.png?v=2" rel="nofollow">https://app.roll20.net/v2/images/roll20-logo.png?v=2</a> that's right, it's Roll20 it's self! You should see a large number of the Site's Pictures show up once you override this security (it blocking the Images) function, the second one is for Hosted content, ranging from Maps to Avatars to Tokens <a href="https://s3.amazonaws.com/files.d20.io/images/14961294/3hA-U4q1fZOsFgE8rzfckA/thumb.png?1451914578724" rel="nofollow">https://s3.amazonaws.com/files.d20.io/images/14961294/3hA-U4q1fZOsFgE8rzfckA/thumb.png?1451914578724</a> specifically that is Ziechael's Avatar Picture. Same process as before; Right Click a Blank Space and then hit the i key (as in "view page info") once these are both explicitly allowed, even your Firewall shouldn't be able to block it unless it actually detects an actual Virus within an image.