Custom DPI: Firefox window height is shorter on window open
The bug exists since Firefox version 131.0 circa, when some things related to DPI had been changed, which I was able to guess because, without touching anything, the size/zoom of the content of the websites were slightly different (bigger). Experiencing this in both Windows and Xfce.
Steps to reproduce:
- Have a custom DPI settings in your operating system.
- Open a new Firefox window.
- Note how the Firefox window height is shorter, so yo can see about 20 pixels of your desktop background. Manually resizing the window and restarting the browser has no effect: the correct height is not remembered.
I've reported this one year ago in the tracker, but no one has yet done anything about it: https://bugzilla.mozilla.org/show_bug.cgi?id=1925284
Am I the only person in the world using Firefox with a custom DPI setting in the OS? I find this hard to believe. Yet I'm experiencing this bug since one years ago. I can't stand using a different browser, but having to resize the window every time is so annoying...
Wšykne wótegrona (4)
In the bug, you wrote:
> Try on Windows 11 with a DPI of "120", same steps.
I don't see a way to set DPI directly, just scaling.
Are you setting the display to 120dpi by setting scaling to 125% using the Scale selector in Display settings? (Math: 1.25 x Windows default 96dpi = 120dpi)
That is a common default scaling for Full HD panels on Windows laptops, so if this setting causes the problem, I would expect a lot of people to be affected.
Or are you setting "Custom Scaling" to 120%, which would yield 115.2dpi?
It was custom scaling, yes. However, I've booted up Windows again, and I cannot reproduce the bug anymore. When I said that this happened on Windows, too, it was probably another issue. I can still see a 1 or 2 pixel gap both at the top and at the bottom, but if you do a web search with "windows 1 pixel gap" there are a lot of results. That was probably what was going on.
On Linux Xfce, instead, I can reproduce it consistently (the gap is way bigger, and only at the bottom) by using any DPI setting less than 120. On Xfce it's in: Settings -> Appearance -> Custom DPI setting and you can set any number there. By setting it to 120 I was able to work around the bug. It's a bit too big of a value for me, though, I don't like it. So I will keep trying other values. Do you know if in this Xfce setting it's a percentage or the actual DPI value? If I understand correctly, I have to calculate the value making sure that it is a whole number (no decimals)?
Regardless, this is still a bug, since it didn't happen in older Firefox versions.
Wót SamXubuntu změnjony
(I don't know anything about Xfce.)
It's certainly possible there was a change in Firefox that affects window dimensions. If you have time to run the Mozregression tool, you can help triangulate on the specific patch that did it: https://mozilla.github.io/mozregression/
jscher2000 - Support Volunteer said
Mozregression tool
Thanks but as you can see in the bug report I've already done that, but sadly they weren't able to find the cause.
Musyśo se pla swójogo konta pśizjawiś, aby na pśinoski wótegronił. Pšosym stajśo pšašanje, jolic hyšći njamaśo wužywaŕske konto.