I’m talking about the fact that the Bookmarks Toolbar in Firefox is always displayed. It is possible to uncheck the toolbar which means that it is not shown which is not what I wanted to do of course. I was looking for a way to increase the space on the screen that the visited website would occupy while still keeping the Bookmarks Toolbar ready to be accessed.

I found a way to hide the Bookmarks Toolbar in Firefox and activate it only if the mouse is hovered over the area where it would normally appear. This way it is possible to have more space available for displaying the website while still being able to access the Bookmarks Toolbar if needed.

If you want to apply this Firefox tweak you do need to access the file userChrome.css which is located in the ‘chrome’ directory of the Firefox profile folder. Add the following two lines at the end of this file and restart Firefox afterwards:

#PersonalToolbar {display: none;}
#navigator-toolbox:hover > #PersonalToolbar {display: -moz-box;}

I tried disabling and enabling the toolbar again which did not have a effect either. I knew that it was important that the so called Bookmark Toolbars icon was added to that toolbar. To check this you have to right-click the top toolbar and select customize from the list.

If there is no icon visible in the Bookmarks Toolbar you have to move it back in. The icon is called Bookmarks in the icons list there. Just drag and drop it into the Bookmarks Toolbar and the bookmarks should be visible again after finishing the customization. My bookmarks were there again which was exactly what I wanted to happen.

You should also make sure that the Bookmarks Toolbar is enabled in Firefox. You can check it by clicking on View > Toolbars > Bookmarks Toolbar.