Firefox tab scrolling is a bit annoying to me. Left and right arrow buttons that appear at either end of the tab bar when you’ve opened up too many tabs to view at once.

Luckily, after doing some search I found that it can be disabled. To disable it:

• Type about:config into your firefox address bar.
• Search for browser.tabs.tabMinWidth key. default value is 100.
• To disable tab scrolling completely, set the value to 0. To make more tabs fit before scrolling gets activated, set that number to 50 (or lower).

Yeah. Great Firefox!