When the number of tabs you open in Firefox is high, your ability to navigate easily is severely damaged - among other things - you can not see the title of the page that is contained in the tab.
Well, FishEyeTabs is one of the extensions that will make Firefox better. Through it, when you run your mouse in a tab, it will expand into a kind of bubble so that you can see the text.
This effect, also known as Fish-Eyes, is useful for detecting any tabs fast.
When you move the mouse from one tab to another, it will automatically resize. The following tabs will be slightly smaller according to the size of the first tab.