Download Interrobang chrome extension. Shortcut: Ctrl+Shift+/ writes an interrobang character. Toolbar button displays window of characters to choose. and install in your Google chrome browser. This is Direct Interrobang Crx download for Chrome it is also called Interrobang offline CRX for chrome Download. This Interrobang is used to Shortcut: Ctrl+Shift+/ writes an interrobang character. Toolbar button displays window of characters to choose.