How to handle quantity if it changed via Firebug?

How to handle quantity if it changed via Firebug?

References

Reference NO 1

http://stackoverflow.com/questions/15202045/how-to-handle-quantity-if-it-changed-via-firebug

Reference NO 2

http://stackoverflow.com/questions/tagged/firebug?page=4&sort=newest

Reference NO 3

http://jitendravyas.com/css/firebug-how-to-switch-hover-and-active-state-of-link/

Reference NO 4

https://www.packtpub.com/article/quick-start-firebug-window-overview-and-inspecting

Reference NO 5

http://www.amazon.com/Instant-Firebug-Starter-Chandan-Luthra/dp/1782161163

Reference NO 6

http://wiki.shopify.com/Ajax_API

Reference NO 7

http://www.seotakeaways.com/e-commerce-tracking-works-google-analytics-ultimate-guide/

Reference NO 8

http://www.excellencemagentoblog.com/magento-add-product-to-cart-ajax