Add it to the opening of new windows in a new tab in the same window

I use a software that opens the Scheduler in a new window. I have in the past had an add on which enabled the new window to open in the original window in a new tab. Add it on disappeared when I refresh Fire Fox but I don't remember the name of the add element on. Thank you.

Have you checked the settings in the Options/Preferences > tabs?

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Tags: Firefox

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