Window and Tab Limiter Use this addon so that you can limit the number of opened tabs.
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Window and Tab Limiter Description

Window and Tab Limiter will automatically close old windows and tabs so you don't wind up with zillions of old windows open at the same time. After rewriting a business system from scratch as a web application, and switching all users over to FireFox, the one problem I wound up with is that a lot of users would never, ever close any windows. By the end of the day, some users would have 20 or 30 browser windows open and wonder why their computer was running slow. They also got very confused trying to naviate through all those windows. So this extension lets you specify the maximum number of windows (or tabs) that can be open at any time (The default value is 10).

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