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There are times when the firefox responds reluctantly. And it is not only when i have opened many tabs. But there are cases when i have opened as many as 20 tabs and firefox is working fine and there are chances when i have opened just 5-6 tabs and firefox behaves lazy.
So, i guess it do not depend on number of tabs and there must be any specific tab which causes the problem.
Isn't there a way to find that tab out and close only that instead of closing complete firefox? Is there any addon for that, or any script?

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The BarTab extension for Firefox might be useful for improving the situation :

BarTab can intercept when tabs are loaded in the background or restored after a browser restart and will only load the content when the tab is actually visited. It also allows you to free memory by unloading already loaded tabs, either manually or automatically.

Otherwise, you might switch temporarily to Google Chrome, where shift-esc displays the per-tab usage:

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You can go to about:memory and click on Measure to see the memory usage for each tab.

It doesn't look as pretty as Chrome's memory view but it does the job.

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Opening the browser to about:memory can show per-tab memory usage.

For more information: http://www.technize.net/firefox-memory-usage/

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