I wanted to set Ctrl+Tab as a shortcut in Chrome to jump between the two most recent tabs. There is an extension that lets you do it. It is called "Recent Tabs". For me setting the shortcut to Ctrl-Tab wasn't possible through the UI. Use this instead:
cd [YOUR CHROME PROFILE DIR] vi Default/Preferences
Problem is that Chrome just overwrites that setting every time. So what I had to do is add this line to my startup shell script
sed -i "s,Ctrl+Q,Ctrl+Tab,g" "$DATA_DIR/Default/Preferences"