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I have been using firefox for quite sometime and today I suddenly started seeing a "yellow shield symbol" in some of my tabs. I am not sure what I might have done to cause this.

Please look at the attached image:

enter image description here

I could remove the icons by right clicking on the tab and un-checking the "Protect Tab" option. what I wanted to know is if this happens automatically or is there a shortcut key to this.

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up vote 2 down vote accepted

That seems to be a feature added by the Tab Mix Plus add-on.


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