sort-tab is smarter tab solution for Emacs, it sort tab with using frequency.

sort-tab stay on top of Emacs, it won't waste any vertically space when you split window.

1. Clone or download this repository (path of the folder is the <path-to-sort-tab> used below).
2. In your ~/.emacs, add the following two lines:

(add-to-list 'load-path "<path-to-sort-tab>") ; add sort-tab to your load-path
(require 'sort-tab)
(sort-tab-mode 1)

• sort-tab-select-next-tab: select next tab
• sort-tab-select-prev-tab: select previous tab
• sort-tab-select-first-tab: select first tab
• sort-tab-select-last-tab: select last tab
• sort-tab-close-current-tab: close current tab

You can bind the number keys to the command sort-tab-select-visible-tab, such as s-1, s-2, s-3 ... etc.

(global-set-key (kbd "s-1") 'sort-tab-select-visible-tab)
(global-set-key (kbd "s-2") 'sort-tab-select-visible-tab)
(global-set-key (kbd "s-3") 'sort-tab-select-visible-tab)
(global-set-key (kbd "s-4") 'sort-tab-select-visible-tab)
(global-set-key (kbd "s-5") 'sort-tab-select-visible-tab)
(global-set-key (kbd "s-6") 'sort-tab-select-visible-tab)
(global-set-key (kbd "s-7") 'sort-tab-select-visible-tab)
(global-set-key (kbd "s-8") 'sort-tab-select-visible-tab)
(global-set-key (kbd "s-9") 'sort-tab-select-visible-tab)
(global-set-key (kbd "s-0") 'sort-tab-select-visible-tab)
(global-set-key (kbd "s-Q") 'sort-tab-close-all-tabs)
(global-set-key (kbd "s-q") 'sort-tab-close-mode-tabs)
(global-set-key (kbd "C-;") 'sort-tab-close-current-tab)

This function automatically recognizes the number at the end of the keystroke and switches to the tab of the corresponding index.