On Tue, 15 Jul 2025 18:49:40 +0200
Rob Schmersel <rob.schmersel@bahnhof.se> wrote:

> Hi,
> 
> The lastest firefox version (140.0.4) on a current system is no longer
> honoring the theme set in XCFE (xfce-4.20.0). This only seem to apply
> to the main window (help screen is using the correct theme), see
> attached screenshot.
> 
> It is more annoying than an actual problem :)
> 
> BR/Rob
> 
> dmesg (head)
> OpenBSD 7.7-current (GENERIC.MP) #53: Fri Jul 11 07:40:44 MDT 2025
>     deraadt@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
> real mem = 16525348864 (15759MB)
> avail mem = 15997751296 (15256MB)
> random: good seed from bootblocks
> mpath0 at root
> scsibus0 at mpath0: 256 targets
> mainbus0 at root
> bios0 at mainbus0: SMBIOS rev. 3.2 @ 0xcd003000 (69 entries)
> bios0: vendor ASUSTeK COMPUTER INC. version "0623" date 05/13/2021
> bios0: ASUSTeK COMPUTER INC. MINIPC PN50
> efi0 at bios0: UEFI 2.7
> efi0: American Megatrends rev 0x50010
> acpi0 at bios0: ACPI 6.0Undefined scope: \\_SB_.PCI0.M291.WLAN
> 
> acpi0: sleep states S0 S3 S4 S5
> acpi0: tables DSDT FACP SSDT IVRS FIDT MSDM MCFG HPET SSDT VFCT BGRT
> TPM2 SSDT CRAT CDIT SSDT SSDT SSDT SSDT APIC SSDT SSDT SSDT FPDT
> acpi0: wakeup devices GPP0(S4) GPP1(S4) GPP2(S4) GPP3(S4) GPP4(S4)
> GPP5(S4) GP17(S4) XHC0(S4) XHC1(S4) GP18(S4) GP19(S4) acpitimer0 at
> acpi0: 3579545 Hz, 32 bits acpimcfg0 at acpi0
> ...

To answer my own question:
theme setting in firefox mentions 'follows OS theme', but there is
another setting in 'customize toolbar' that apparently set how the main
window is using the theme:
 * Right-click the toolbar and choose “Customize Toolbar” from the popup
 * In the window check the titlebar checkbox.

And voila it is following the OS theme. 

BR/Rob
menu.