(1) Click on this URL to install Addon. Save Addon to your machine.

https://mbapp.manupatra.in/downloads/Manupatra.xpi

(2) Click on Add-ons option from bar.

(3) Select "Install Addon from file" by clicking on icon.

(4) Select Add-ons from your saved location (machine) to install

(5) Once Addons will install, it ask you to restart the browser.