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I am getting pop-ups on my MacBook. It doesn't happen in Safari and my Firefox is updated. How do I fix?

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I called Apple tech support (paid the fee) and they said it was clearly an issue with Firefox. How do I get rid of this virus? I definitely don't want to use a third party software like MacBook Keeper or Norton as they are not recommended for Apple products.

I really don't want to stop using Firefox.

I called Apple tech support (paid the fee) and they said it was clearly an issue with Firefox. How do I get rid of this virus? I definitely don't want to use a third party software like MacBook Keeper or Norton as they are not recommended for Apple products. I really don't want to stop using Firefox.

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Are these just the occasional ad here and there or something more persistent?

For occasional popups that bypass Firefox's filter, you can try an add-on such as Adblock Plus which has a companion add-on specific to popups.

For persistent popups, these might be caused by one of your add-ons. Could you test the page in Firefox's Safe Mode? That's a standard diagnostic tool to deactivate extensions and some advanced features of Firefox. More info: Diagnose Firefox issues using Troubleshoot Mode.

You can restart Firefox in Safe Mode using

Help > Restart with Add-ons Disabled (Flash and other plugins still run)

In the dialog, click "Start in Safe Mode" (not Reset)

Any difference?