Menu-Button in Firefox
Before the instructions start, you need to have hidden files show. Also , the file extensions should be displayed.
- Then in the file Explorer to the following path: C:\Benutzer\\AppData\Roaming\Mozilla\Firefox\Profiles\.
- In this directory create a new folder with the name "chrome".
- In this folder you will save with the help of desTexteditors any file with the name "userchrome.css".
- In this Text file you type: "@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); #PanelUI-button {display: none !important;}" (without the quotation marks).
- Close all Firefox Windows and restart the Browser. The menu Button is now gone.

Firefox 29.0: menu-Button removed
The menu Button is not the only new feature in Firefox 29.0, inform you about the further innovations of the Firefox.