Firefox 9: Is it possible to set a relative width for toolbars? I have my bookmarks toolbar placed on the right of the location bar. Userchrome.css settings are: ''#urlbar, #urlbar-container {min-width: 200px !important; max-width: 620px !important;}'' ''#personal-bookmarks {min-width: 200px !important; max-width: 700px !important;}'' I'd like to set the width of both toolbars to be 50% of the whole window width at all times. Right now it looks ok when the window is maximized. However, if I decrease the window's width, the bookmark toolbar will always have the maximum width and so the urlbar will be too small to be useful. See attached screenshots: [http://i.imgur.com/bTGdR.png full width window] [http://i.imgur.com/Hub2c.png resized window]