Mozilla Firefox, maybe the second most used browser in the World behind Google Chrome (not counting Internet Explorer).

That however does not mean the browser is devoid of bugs, in fact there are plenty of those, but mostly caused by the add-ons which we use.

Recently my friend reported that his Firefox crashed, and after he opened the browser, he said that the close button was missing in every single tab. I asked him if he saw an X button at the end of the tabs (on the right), and it was not there.

Tip: You can close individual Firefox tabs by hovering over a tab, and pressing the middle button on the mouse (the scroll-wheel). Alternatively you can also [...]