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How can I lock Firefox from updating my titlebar?

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I use tabs and wish to have one browser window open per subject so i can open multiple tabs per subject in one browser window to keep everything organized. In order to tell the browser windows from each other I would like to set permanent title bars.

I use tabs and wish to have one browser window open per subject so i can open multiple tabs per subject in one browser window to keep everything organized. In order to tell the browser windows from each other I would like to set permanent title bars.

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The title of a window is always the title of the active tab in the window (specifically, the <title> in the document in that tab). I think you would need an add-on to modify that behavior.

According to this four-year-old thread, the Nightly Tester Tools extension has (or had) something along those lines: How do I modify the Taskbar text?