User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:48.0) Gecko/20100101 Firefox/48.0 Build ID: 20160309030419 Steps to reproduce: Using Nightly (v48.0a1) 64 bit, Windows 10 64 bit Browser is running on my notebook screen (Microsoft Surface Book at 3000x2000) with Windows scaling set to 175%. There is an external display connected which is at 1920x1080 set at 100% scaling. The laptop display is set as secondary. Actual results: Clicked a link to download a file. Dialog box for saving appeared with very small text size. It looks like it isn't taking into account the scaling set for the secondary display. The browser, outside of this dialog box, seems to use appropriate scaling. Expected results: A dialog with the same scaling as the rest of the browser should have appeared. Please see the attached screen capture which shows the dialog overlaid on a page with 100% zoom

Hi Adrian, I don't have the necessary hardware to test this issue. But I will assign a component to it, maybe someone with more experience could share an opinion on this. Thanks, Cosmin.

I suspect this is probably the same issue as described in bug 1254026. If you set the laptop screen to be the primary display, does that basically reverse the symptoms (as described in bug 1254026 comment 3)?

Note that it may be necessary to log out of Windows after changing the primary display, before the new setup will fully take effect.

Adrian, have you managed to test what Jonathan suggested in comment 2?

I'm confident this is the same issue as bug 1254026; marking as duplicate.

Could someone clear out the notification for needed confirmation, since the bug's been resolved.