Configuring The Scrolling Tabs

When you opened many tabs, Firefox will not keep on reducing the tab width. 

Instead, it shows a scrolling bar so that the min width (100px) is conserved and you can scroll to find your tabs. 

If you are those who don't like the scrolling tab function and prefer Firefox to show all the tabs, regardless how 

small it is, you can set the value of ,browser.tabs.tabMinWidth to 0 to disable it in about:config(type it in a browser). 

Similarly, if you want Firefox to display more tabs before showing the scrolling button, 

you can reduce the default value to a lower value, say 75 pixels.

Config name: browser.tabs.tabMinWidth

Default: 100

Modified value: 0 if you want to disable the scrolling functions, other values to set the min width value