I added as a bookmark
chrome://browser/content/places/bookmarksSidebar.xhtml
to Bookmarks Bar and when I hit Ctrl+Shift+B and click on this bookmark it opens correctly.

But when I have "Bookmarks Bar" option in my HumbleNewTabPage displaying this exact bookmark and I click on it nothing happens. It seems to be a bug. All other normal addresses like https:// for example google or imgur links are opened correctly.

At the same time when I have in my HumbleNewTabPage "Recently closed" displayed the above address and I click on it, it opens correctly.

I noticed that when I right click on this bookmark in HumbleNewTabPage "Bookmarks Bar" section and choose: "open in new tab", it opens a new tab with this address in Firefox address bar but I need to point mouse to the address bar and hit Enter to open this address.

Firefox 126 from Flatpak

Operating System: Manjaro Linux
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
Kernel Version: 6.6.30-2-MANJARO (64-bit)
Graphics Platform: Wayland