NumExt numbers your tabs with no limitation on how many tabs you can open. The numbering is done using simple text, adding no overload on the tabs. It is therefore a very lightweight, straight forward useful extension for those who wishes to number their tab for easy access using Ctrl + number. Since the number of tabs accessible through Ctrl + number is limited from 1 to 8. With NumExt, you can use shortcut keys Alt + numbers from 1 to 9 for tabs numbered 9 to 17 (KEEP IN MIND, THE ALT key bind only applies to Windows Operating Systems) Alt + X - enables a small box under which NumExt commands can be entered. To close the little NumExt text box, press again on "Alt X".Requirements:

Ссылка: http://releases..b/mozilla.org/addons/9528/numext_-_numbered_tabs-0.7.2-fx.xpi