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Weird address/title bar behaviour on Mozilla Firefox Developer Edition

g3nsys

Since the last update (I know that Firefox DE is a beta/semi-nightly release, I just want to know if this is my mistake or a bug), only my first firefox window has address bar, all the other windows don't. And when tabs are vertical, the rest of the windows don't even have a title bar. (This behavior doesn't apply to newly created windows) Also, non-primary windows also lose the capacity to resize the vertical tab bar. ¿Did I do something wrong or is this a bug?

Since the last update (I know that Firefox DE is a beta/semi-nightly release, I just want to know if this is my mistake or a bug), only my first firefox window has address bar, all the other windows don't. And when tabs are vertical, the rest of the windows don't even have a title bar. (This behavior doesn't apply to newly created windows) Also, non-primary windows also lose the capacity to resize the vertical tab bar. ¿Did I do something wrong or is this a bug?
Attached screenshots

All Replies (3)

Nothing really jumps out at me from the already known bugs — do you see the same if you restart into Troubleshoot Mode (from Help menu)?

I'm having the same issue - I have about 30 windows open usually (Firefox DE 156.0b2, macOS 26.6.1)

Only one window, plus new windows I create, has an address bar and toolbar - the others do not, and I can't see how to get them back (I've beta tested since Firefox 0.1 and Thunderbird before that, this is the first time I have had a bug this major)

Also I cannot scroll in the windows without address bars, so essentially the entire UI has disappeared except for the tab bar

I tried turning off extensions that I thought would interfere, but that didn't make a difference...

I'll basically have to work out of one window for a bit, breaking my organisation of titled windows and tab groups (Window Titler is also broken due to a change in how windows are titled with domain first, but that's a separate issue)

UI behaviour is identical in Troubleshooting mode (address bar only in 2 windows, one previous, plus what I created after updating, windows without address bars cannot scroll) (DE 156.0b2, macOS 26.6.1)

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