My counter stops working when people change tabs

My counter stops working when people change tabs

References

Reference NO 1

http://stackoverflow.com/questions/15192728/my-counter-stops-working-when-people-change-tabs

Reference NO 2

http://lifehacker.com/5984149/why-you-should-never-have-more-than-nine-browser-tabs-open

Reference NO 3

https://chrome.google.com/webstore/detail/tabs-outliner/eggkanocgddhmamlbiijnphhppkpkmkl?hl=en

Reference NO 4

http://betanews.com/2013/05/30/google-gets-it-terribly-terribly-wrong-with-gmail-tabs-and-makes-me-angry/

Reference NO 5

https://developers.facebook.com/roadmap/completed-changes/

Reference NO 6

http://community.qlikview.com/community/new-to-qlikview

Reference NO 7

http://socialfixer.com/blog/category/releasenotes/

Reference NO 8

http://www.ultimate-guitar.com/columns/the_guide_to/4_tips_to_switch_guitar_chords_faster.html