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what does the blue line under facebook tab mean?

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I understand the blue line above the current tab to indicate that it is currently active but specifically facebook it will have a blue line underneath the tab name and when using it both the line i am describing and the active blue line on top

I understand the blue line above the current tab to indicate that it is currently active but specifically facebook it will have a blue line underneath the tab name and when using it both the line i am describing and the active blue line on top

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This is probably the Facebook containers add-on. https://addons.mozilla.org/en-US/firefox/addon/facebook-container/

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Moses said

This is probably the Facebook containers add-on. https://addons.mozilla.org/en-US/firefox/addon/facebook-container/

thanks! i forgot i had installed it