How to Turn On Orange Button for Firefox in Linux

Firefox in Linux with Orange Button

If you open Firefox browser in Linux you will be see some thing like following which is not having Windows Firefox look.

Default Firefox Window in Linux

However if you remove ✓ mark in  View->Tool Bars->Menu Bar, you can see the Firefox button.

How to Remove Menu Bar in Firefox

Now your Firefox is like this. Even it has Firefox button, it is Grey and not like Windows Orange Firefox button.

Grey Firefox Button

To make it Orange, you need to install an add-on to Firefox named "Themed Button for Linux".
Add-on can be obtained from
https://addons.mozilla.org/en-US/firefox/addon/themed-button-for-linux/

Install the add-on and restart the Firefox, you will get your Orange Firefox Button. It turns in to Purple in private browsing.

After Installing Themed Button for Linux

Firefox Button Becomes Purple in Private Browsing