Shing Lyu

Show Firefox Bookmark Toolbar in Fullscreen Mode

By Shing Lyu    

Disclaimer: The views expressed here are my own; they do not reflect the views of my current and past employers.

By default, the bookmark toolbar is hidden when Firefox goes into fullscreen mode. It’s quite annoying because I use the bookmark toolbar a lot. And since I use i3 window manager, I also use the fullscreen mode very often to avoid resizing the window. After some googling I found this quick solution on SUMO (Firefox commuity is awesome!).


The idea is that the Firefox chrome (not to be confused with the Google Chrome browser) is defined using XUL. You can adjust its styling using CSS. The user defined chrome CSS is located in your Firefox profile. Here is how you do it:


@namespace url(""); /* only needed once */

/* full screen toolbars */
#navigator-toolbox[inFullscreen] toolbar:not([collapsed="true"]) {


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