When i stay on another tab for a long time and then goes back to the facebook tab, firefox will open the tab for about 5-10 seconds...it looks like a lag

if i use firefox and open tabs, the moment that i go back to the facebook tab, it would take firefox 5-10 seconds to open the facebook tab.it's really annoying

That is most likely caused by Firefox releasing memory used in that tab to minimize the memory that is currently in use.<br />
This includes memory that stores the DOM tree and that tree needs to be rebuild to allow navigation scrolling and clicking items on the page.<br />
On complicated pages that have a lot of elements this can take a few seconds.
See also:
*http://blog.kylehuey.com/post/21892343371/fixing-the-memory-leak about:khuey - Fixing the Memory Leak

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