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"The activating button is located per default in the bottom-right of the addons bar, but you can freely replace it." Sure, if you can find an addons bar in Firefox, which I can't.
You should install an addon to see it, dude:) If you are not comfortable enough with Firefox usage, please make a support query - this extention isn't guilty of user's ignorance.
Наконец-то нашла рабочее дополнение для укорачивания ссылок.