Tabmania Allows to open a lot of features in the tabs by default.
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Tabmania Tags

tab open Feature Open Tab Browser Tab open features

Tabmania Description

Tabmania allows users to open all the features of their Firefox browser in different tabs instead of different windows. For example, due to Tabmania, the functionality included in the Options window will be displayed as a new tab, so you simply need to switch tabs in order to be able to access these settings.

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