Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Theme support for 4k monitors?

more options

Is there theme support for 4k monitors? Every theme I try fills only 3/4th of the title bar. It does not seem to be theme-specific, the cut-off point is always the same.

Is there theme support for 4k monitors? Every theme I try fills only 3/4th of the title bar. It does not seem to be theme-specific, the cut-off point is always the same.
Attached screenshots

Modified by Sogomn

Chosen solution

Designed before 4k monitors were made. I doubt if the specs will ever be updated.

https://developer.mozilla.org/en-US/Add-ons/Themes/Lightweight_themes

Image Requirements

   Dimensions should be 3000px wide × 200px high
   PNG or JPG file format
   Image must be no larger than 300 KB in file size

Image is aligned to the upper-right corner.

Thus the left side is 'missing' with 4,000 pixel wide screens. And with Quantum, users will never need that 200 px height. The days of 6 or 8 add-on toolbars is "history".

Read this answer in context 👍 1

All Replies (6)

more options

Have you tried the builtin themes?

more options

Chosen Solution

Designed before 4k monitors were made. I doubt if the specs will ever be updated.

https://developer.mozilla.org/en-US/Add-ons/Themes/Lightweight_themes

Image Requirements

   Dimensions should be 3000px wide × 200px high
   PNG or JPG file format
   Image must be no larger than 300 KB in file size

Image is aligned to the upper-right corner.

Thus the left side is 'missing' with 4,000 pixel wide screens. And with Quantum, users will never need that 200 px height. The days of 6 or 8 add-on toolbars is "history".

more options

Mkll said

Have you tried the builtin themes?

Yeah but that's not the point.

the-edmeister said

Designed before 4k monitors were made. I doubt if the specs will ever be updated. Thus the left side is 'missing' with 4,000 pixel wide screens. And with Quantum, users will never need that 200 px height. The days of 6 or 8 add-on toolbars is "history".

Ah! So there are restrictions on the specs. That's unfortunate.

Thanks for the answers!

more options

If it will not be fixed, they can simply delete ALL themes with background images, allowing only solid colours. 4K monitors are becoming more and more common, 5K monitors exist, even 8K monitors are on the way now, so NOT fixing this is the same as declaring firefox (or at least the mostpart of all themes in it) dead and out of its time.

more options

The time may come when Mozilla needs to update the image size requirements or just stop supporting those lightweight themes, but I guess that time hasn't come yet.

more options

I've discovered that one way to fix this is to go to about:config and change layout.css.devPixelsPerPx to 1.3 or higher. This scales up the entire browser, bigger ui, bigger text, bigger everything, so might not be a desired solution for everyone. If the browser could have a toggle "on/off/auto" or some sort of slider or possibly a simple plugin where users with screen-resolution higher than 3000 can set theme-scaling for only THAT background image and not the whole browser, it could work until some programmer behind firefox comes up with a more elegant solution to this.