Taskbar doesn't appear on hover in Firefox 141/142 when taskbar auto-hide is enabled (Windows 10)
Sorry for my language.
The latest versions of Firefox 141 (and 142 beta 1) do not allow the Windows taskbar to appear when I move the mouse to the bottom of the screen. This happens on Windows 10 with the auto-hide taskbar setting enabled. In previous Firefox versions, this worked fine (except for one older version where it briefly broke). I’m not running Firefox in fullscreen mode, and I have no modifications or themes that could interfere. I tested this on a fresh, clean installation of Firefox — the issue still occurs. After downgrading to versions 140 and 139, everything works correctly again. Interestingly, I also tested the Firefox 141 Release Candidate Build 1 from here: 🔗 https://ftp.mozilla.org/pub/firefox/candidates/141.0-candidates/ In that version, the issue only occurred in private browsing mode. Could someone please help me resolve this or confirm it as a bug? Thanks in advance!
All Replies (2)
The traditional method for tracking down the change that caused the issue is Mozregression (linked below), but you also could file a bug on Bugzilla and someone might have an intuition as to what caused the issue.
If this is a critical issue for you right now, you could consider switching to the Extended Support Release of Firefox 140 as your main browser, and keep an eye on Firefox Developer Edition (based on the beta of the next major release) to monitor new developments for mainstream Firefox.
Error is somewhere in xul.dll cause i replace it from candidate build 1 to build 2 an it works (not in incognito mode). Please someone report this bug cause i can't :(
______________________________________________________________ On Windows 10 with auto-hide taskbar enabled, the taskbar no longer appears when hovering the mouse at the bottom of the screen in **Private Browsing mode**, starting with **Firefox 141 Candidate Build 2**.
This issue is not present in: - Candidate Build 1 of Firefox 141 - Firefox 140 or 139 - Normal (non-private) windows
The issue is **NOT caused by prefs.js, user.js, or xulstore.json**. I verified this by swapping only the `xul.dll` file from Candidate Build 1 into Build 2 – and the taskbar behavior is restored (at least in normal mode).
This clearly indicates a **regression introduced in the binary (likely related to window flags or focus management)**.
Steps to reproduce: 1. Use Windows 10 with taskbar set to auto-hide. 2. Open Firefox 141 (Candidate Build 2 or newer). 3. Open a Private Browsing window. 4. Move mouse to the bottom of the screen – taskbar does not appear. 5. Replace `xul.dll` from Build 1 – behavior is restored in normal mode.
This issue negatively affects usability and system interaction for private mode users.
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