YASB possibly interfering with Firefox taskbar tabs

[Ryunam]

Windows version

Windows 11

Windows OS build

24H2 (OS Build 26100.7462)

YASB version installed

1.9.1 x64 (Stable)

Describe the bug

Hi, thank you first of all for developing this wonderful piece of software.
Lately I have experienced some odd behavior when having YASB active and using Firefox taskbar tabs (the native Firefox PWA "apps", which have been implemented in the browser not too long ago).

What happens is the following:

• Upon launch, if the pinned Firefox taskbar tabs are clicked on from the taskbar before YASB is initiated, the tabs in question will open as normal from their respective icon, separate from the main Firefox taskbar icon. This is the intended behavior.
• Instead, if those taskbar tabs are started after launching YASB, the tabs will open from the main Firefox taskbar icon instead of their own taskbar icon, as if they were a normal Firefox instance.

This only happens while using YASB. Closing Firefox, quitting YASB, then re-opening Firefox and its taskbar tabs without YASB running consistently restores the intended behavior.

Widgets currently active:

• "clock",
• "launchpad"
• "systray",
• "cpu",
• "memory",
• "disk",
• "traffic",
• "volume",
• "settings",
• "notifications",
• "power_menu"

[I am also including here an excerpt from the log, but I'm not noticing anything special that might be relevant to this issue].

Relevant log output

2026-04-01 11:01:37,947 [INFO] [MainThread] [root/log.py:99]: YASB v1.9.1
2026-04-01 11:01:37,948 [INFO] [CLIPipeServer] [cli_server/cli_server.py:215]: CLI server started v1.1.6
2026-04-01 11:01:37,949 [INFO] [MainThread] [cli_server/cli_server.py:106]: Log pipe server started
2026-04-01 11:01:39,186 [INFO] [MainThread] [root/service.py:52]: AudioOutputService starting...
2026-04-01 11:01:39,356 [INFO] [MainThread] [root/bar_manager.py:95]: Starting WindowsNotificationEventListener...
2026-04-01 11:01:39,358 [INFO] [MainThread] [root/watcher.py:65]: Watching directory: c:\users\[username]\.config\yasb
2026-04-01 11:01:39,358 [INFO] [MainThread] [root/watcher.py:104]: Created file watcher
2026-04-01 11:01:39,702 [INFO] [MainThread] [root/update_service.py:429]: Background update checker started
2026-04-01 11:01:40,055 [DEBUG] [MainThread] [systray_widget/systray.py:614]: Loading state from C:\Users\[username]\AppData\Local\YASB\systray_state_[xxx].json
2026-04-01 11:01:40,064 [DEBUG] [SystrayMonitor] [systray_widget/systray.py:63]: Systray monitor thread is starting...
2026-04-01 11:01:40,273 [DEBUG] [SystrayMonitor] [systray_widget/systray_monitor.py:119]: Adding TaskbandHWND prop to hwnd 67164
2026-04-01 11:01:40,274 [DEBUG] [SystrayMonitor] [systray_widget/systray_monitor.py:197]: Finding real tray hwnd
2026-04-01 11:01:40,283 [DEBUG] [MainThread] [systray_widget/systray.py:261]: Sending TaskbarCreated message: 49337
2026-04-01 11:01:40,283 [DEBUG] [MainThread] [systray_widget/systray.py:263]: Systray icons refreshed

[amnweb]

Hmm, I can't reproduce anything like that. Can you record a video and show me this issue so I can better understand the problem?

[Ryunam]

Thank you for your quick response. Upon closer inspection, it seems that some part of the theme I had installed, or some part of the custom configuration on top of the theme itself, might have caused the weird behavior in question.

I re-installed a default theme from scratch and apparently it's not happening anymore...
I will keep this thread open for now as I investigate this further, but it does seem to be some theme-related issue.

[Ryunam]

Hi again! I have managed to narrow this down to the "taskbar" widget, on both my desktop PC and on a Surface Pro 7 (both using Windows 11).
Any YASB theme that incorporates the "taskbar" widget causes Firefox PWA / "taskbar tabs" to misbehave in my configuration. Removing that widget from config.yaml eliminates the problem.
It's as if YASB is not correctly interpreting the "identity" of the links created by the Firefox PWA / taskbar tab implementation correctly, thus causing those tab launches to be grouped as normal Firefox instead of their separate app icons.

I will try to record this later on, as soon as I can.