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How do I get the pop-up blocker warning sign?

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How do I get the pop-up blocker warning sign back when I click something that involves another page?

This happened

Every time Firefox opened

== I accidentily clicked the 'don't show this button'

How do I get the pop-up blocker warning sign back when I click something that involves another page? == This happened == Every time Firefox opened == I accidentily clicked the 'don't show this button'

All Replies (3)

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In the location bar, type about:config and press Enter. Click on I'll be careful, I promise! In the resulting page, search for the preference privacy.popups.showBrowserMessage. Double-click on it, which should set the value to true.

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where is the location bar?

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I've attached a screenshot.