Scaling in hidpi - ubuntu 18.04 - Report ID: 1694376812


I am running Ubuntu 18.04 in a hidpi monitor (3840x2160). Zotero 5.0.53 does not scale correctly.
All UI elements are double in size. Screen capture is here:

Can I force Zotero to a specific scale, perhaps by a configuration option or environment variable?

  • If you open a JS console in your browser, what's the value for window.devicePixelRatio?
  • Basically, there's layout.css.devPixelsPerPx in Advanced → Config Editor, but it should be set to -1.0 by default, which should make it automatically detect the scaling factor the same as in Firefox.
  • window.devicePixelRatio is 2.

    I changed layout.css.devPixelsPerPx from -1 to 2. The Toolbar is now scaled properly, but all the other UI elements are not:
  • Did you restart Zotero?
  • Yes, the scaling issue remains.
  • I don't really have a suggestion here. Given that even the menu bar isn't being scaled properly, there's clearly a more general problem with the detection on your system. This isn't our code — it's just Firefox stuff — and we haven't had other recent reports of this.

    What happens if you open Firefox 52 ESR?
  • Well thanks a lot for the suggestion, it helped a lot.

    It turns out it is a bug in Firefox 52 ESR (

    A workaround is to set the environment variable GDK_DPI_SCALE to the correct value before starting Zotero. In my case it is:
    export GDK_DPI_SCALE=0.5

  • OK, great. We should be updating Zotero to a Firefox 60 base soon, so this should go away.
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