Dialog size doesn't match content size when using "Default zoom" setting in Firefox

[benblank]

I set the "Default zoom" setting in Firefox to 150% in order to make pages easier to read on my laptop screen. Unfortunately, this seems to cause issues for Open in Browser, as the content of the dialog honors the zoom level (which is great!), but the dialog size doesn't (which is less great).

For example, here's a screenshot of how Open in Browser's dialogs look when they open:

However, it's clearly sizing the dialog correctly for its content if the zoom level is ignored. If I use Ctrl+MouseWheel to zoom back out to 100%¹ in the same dialog which appears above, the content fits the dialog perfectly:

Footnotes

1. Kind of… If I only zoom out to 100% (five steps), the content still overflows the dialog. But if I zoom out to 90% (six steps) and then back in to 100%, the content fits perfectly, as shown in the second screenshot. ↩

[regs01]

It's not possible to fix, until Mozilla will implement getScreenDetails. As element bounds already taking your screen scale into account, so you need to subtract it. But there is no way to know it in Firefox right now.
https://caniuse.com/mdn-api_window_getscreendetails
https://developer.mozilla.org/en-US/docs/Web/API/ScreenDetails

As a workaround you can set 100% scale specifically for this extension, using Ctrl-- and Ctrl-+ or Ctrl-MouseWheel, as you said.

Aside that you have another problem, which is excessively huge system font size. You better reduce it to 10 pt and use scaling, which is in Display and Monitor settings of KDE, instead. And better not to use anything in between 100, 150, 200 and 300.

[benblank]

It's a shame it isn't directly addressable right now; hopefully, Mozilla will add support for that API as it gets closer to stable. In the meantime, I'll try page-specific zoom workaround you mention.

Aside that you have another problem, which is excessively huge system font size. You better reduce it to 10 pt and use scaling, which is in Display and Monitor settings of KDE, instead. And better not to use anything in between 100, 150, 200 and 300.

I'll have to take a look at this again, then. I've tried adjusting the scaling, but have always had issues with blurriness and overlarge UI elements, even at those scaling levels. I have to admit I'm also quite curious as to how you knew I was using a large font size without scaling just from those screenshots; it's a pretty neat party trick! 🙂