Introducing tabs by Firefox was a great idea but when we are working with lot of them, Firefox will shrink them and scroll the others off screen.
This tutorial will help you how to see all the tabs by changing the tab width or turning off the scrolling feature.
1. Open Firefox 2.0 and type about:config .
2. A list of keys will appear. Navigate to browser.tabs.tabMinWidth.
The default value is 100 and that means that the minimum width of a tab is 100 pixels. You can modify this value by double clicking on it. If you want to disable the feature enter 0.