Open Bug 1857694 Opened 8 months ago Updated 8 months ago

[meta] 115 Supernova font / screen scaling size issues (eg oversized/huge)


(Thunderbird :: Mail Window Front End, defect, P2)

Thunderbird 115


(Not tracked)


(Reporter: wsmwk, Unassigned)


(Depends on 3 open bugs)


(Keywords: meta)

No description provided.
No longer depends on: 1854607
Depends on: 1854607
Summary: [meta] 115 font / screen scaling size issues (eg oversized/huge) → [meta] 115 Supernova font / screen scaling size issues (eg oversized/huge) is one of the Thunderbird reports Anje and I have been struggling with in recent weeks. Chatting with Geoff this evening, layout.css.devPixelsPerPx can definitely be a cause, as Anje attempts to get at in that SUMO posting. describes the issue for Firefox.

A non-default value can block all the 115 based UI size controls. And Help > Troubleshoot Mode doesn't block the non-default value.

Anje's instructions from SUMO ...

Check the Config Editor for this settings:

  • Settings > General
  • scroll to bottom and click on 'Config Editor' button

It opens in a new tab

  • In top search type:''' pixels'''
  • look for this line :''' layout.css.devPixelsPerPx'''
  • default is a '''negative '''number '''-1.0'''

It should not be in bold text, if bold text then it has been altered.

  • If you have anything else in that setting use the arrow icon on far right - click on it and the default is reset.

layout.css.devPixelsPerPx is preference that comes from Firefox and we don't use nor support.
Probably these users edited it in the past when Thunderbird UI wasn't really responsive nor scalable via built-in density or font size.
I don't think we have any control over that pref, and we can't even ignore it.

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