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There are some popular third-party free popup blocker extensions for Firefox.
Below we introduce 5 Firefox popup blocker extensions for your reference.
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This web extension can allow or block all popups, block/allow all but whitelist, etc.
This free pop-up blocker extension supports desktop and Android.
it’s possible for you to get this free extension from Firefox add-ons page.

This extension is available for Firefox, Chrome, Edge, Chromium, Opera, Safari, etc.
you might add this extension to your Firefox surfing app to help you sift or block popups/ads in Firefox.
Check the step-by-step guide.
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To disable it, you might hit the ad blocker icon and toggle the switch off.
Firefox also has a built-in pop-up blocker.
ClickSave Changesbutton to save the controls.
How to block someone on LinkedIn?
This post offers a step-by-step guide.
If you want to unblock someone on LinkedIn, the guide is also provided.