I can't track down any intentional change to download handling in Firefox 137. Maybe your handlers.json file (which stores your choices) was regenerated with current default options for some reason? Servers can send different Content-Disposition instructions with a file: * attachment => tells the browser to handle externally rather than display in a tab * inline => tells the browser to display in a tab (or embedded in a page) * (none) => browsers treat as inline So there shouldn't be a problem with most images, just ones that servers try to force you to save. But is there a fix for those? Hmm, I can't think of a built-in setting.