This bug is a spin-off from bug 39553. The vertical scrollbar appears to be linked to the menubar at the top. If you make the horizontal width of the window smaller than the menubar, the scrollbar disappears. Also, if the default menubar font is so large that the menubar is longer than the window, then the window comes up without a vertical scrollbar. I don't think this is very good behavior. The vertical scrollbar should always be there (if the document is longer than the window). It might also be nice to do something about the menubar if the window is too narrow for it. (Double up the menubar, or make it scrollable, or do whatever the UI guidelines du jour mandate.) Also, the window should not come up with a fixed size. If the user has poor eyesight, they may have selected a large UI font, and the window had better be large enough to show the whole menubar. Eric, if you're not the right assignee, please re-assign. Also, I don't know if this is a Linux-only problem.

Changing OS to All; same problem with the 2000-05-17-08-M16 nightly binary on WinNT. The vertical scrollbar goes away and comes back as the browser window is narrowed to less than the menubar width and made wider again.

This isn't just about the vertical scrollbars -- the entire content area has a minimum width. If you reduce the width of the browser window beyond the point where the vertical scrollbar disappears, you'll notice that you can drag the horizontal scrollbar farther than it looks like you can. On 2000 052508 win98, the content area has at least *two* minimum widths: - width of menubar (up to the last menu item) - the width which causes the url textbox to have a width of 0 (so that the search button is right next to the draggable icon) updating summary. eek, that's long. Once this is fixed, bug 31515 needs to be tested again.

*** Bug 41432 has been marked as a duplicate of this bug. ***

I have fixed this at least 3 times now but people keep undoing it. Ben its your turn. How to fix. 1) Turn on debug xul boxes 2) you will see that the toolboxes, menubars min widths are too bug set them to a small value like 1px so they can shrink small enough.

*** Bug 44441 has been marked as a duplicate of this bug. ***

isn´t this a dup of bug 20318 ?

*** Bug 52378 has been marked as a duplicate of this bug. ***

Howarth is right: this is a DUP of bug 20318, "Scrollbar disappears if window is made small enough", which has seen scheduling, and has a proposed solution. *** This bug has been marked as a duplicate of 20318 ***

Verified dupe of bug 20318: "Vertical & horizontal scrollbars disappear if window too small (narrow, short)"