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how to get rid of a malware pop-up messages on MacBookPro

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When I'm using Firefox, on reputable sites, this screen pops up, along with a bunch of beeps. It appears to be from Firefox, but I assume it isn't. Where is coming from? Is is dangerous? How do I get rid of it?

I called Apple support, and they helped me run a scan with MalwareBytes (the scan came up clean), but the problem is still recurring. The Apple support person said to contact Firefox.

When I'm using Firefox, on reputable sites, this screen pops up, along with a bunch of beeps. It appears to be from Firefox, but I assume it isn't. Where is coming from? Is is dangerous? How do I get rid of it? I called Apple support, and they helped me run a scan with MalwareBytes (the scan came up clean), but the problem is still recurring. The Apple support person said to contact Firefox.
Attached screenshots

Modified by PamCC

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Additional System Details

Installed Plug-ins

  • Shockwave Flash 32.0 r0

Application

  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:65.0) Gecko/20100101 Firefox/65.0

More Information

Helpful Reply

The image didn't attach to the question. Here it is.

The image didn't attach to the question. Here it is.
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WestEnd
  • Top 25 Contributor
61 solutions 5303 answers

That url isn't from mozilla nor firefox. Sounds like something from FB itself that is infected.

That url isn't from mozilla nor firefox. Sounds like something from FB itself that is infected.
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FredMcD
  • Top 10 Contributor
4147 solutions 57896 answers

Helpful Reply

You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.
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cor-el
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  • Moderator
17273 solutions 156121 answers

Such pop-ups are always a scam and clicking the button to proceed can give you malware even if you are on a Mac.

Such pop-ups are always a scam and clicking the button to proceed can give you malware even if you are on a Mac.
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Question owner

Thank you, all. Luckily, I did not click the button to proceed. The scan from CleanMyMac X was clean, but perhaps I will try to run some of the others. I didn't realize that different programs detect different issues. Thank you!

Thank you, all. Luckily, I did not click the button to proceed. The scan from CleanMyMac X was clean, but perhaps I will try to run some of the others. I didn't realize that different programs detect different issues. Thank you!
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Question owner

I'm still having the same problem. Here is another box that's popping up. Any other advice?

I'm still having the same problem. Here is another box that's popping up. Any other advice?
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cor-el
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17273 solutions 156121 answers

How do you end up on the websites that open such pop-ups? The URL that shows in the screenshot isn't a URL you would normally visit.


You can check for recently installed suspicious or unknown extensions.

How do you end up on the websites that open such pop-ups? The URL that shows in the screenshot isn't a URL you would normally visit. ---- You can check for recently installed suspicious or unknown extensions. *https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems
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Question owner

Hi, they have been coming up when I'm on cbc.ca or Facebook.com. A new tab opens up (even when I haven't clicked on anything, I'm just scrolling) and the pop-up comes up.

Hi, they have been coming up when I'm on cbc.ca or Facebook.com. A new tab opens up (even when I haven't clicked on anything, I'm just scrolling) and the pop-up comes up.
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FredMcD
  • Top 10 Contributor
4147 solutions 57896 answers

Go to the Mozilla Add-ons Web Page {web Link} (There’s a lot of good stuff here) and search for a good ad blocker.

Go to the [https://addons.mozilla.org/en-US/firefox/ Mozilla Add-ons Web Page] {web Link} (There’s a lot of good stuff here) and search for a good ad blocker.

Modified by James

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Question owner

Thank you!

Thank you!
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Tyler Downer
  • Top 25 Contributor
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1520 solutions 10584 answers

I suggest using uBlock Origin, https://addons.mozilla.org/firefox/addon/ublock-origin/

I hope this helps!

I suggest using uBlock Origin, https://addons.mozilla.org/firefox/addon/ublock-origin/ I hope this helps!
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Ollie 2 solutions 12 answers

Have a chat with facebook and cbc and tell them to check their website. It may be an attack/hacker that has put an automatic redirect onto the site. It is a long shot but it's the kind of stuff that is happening now-a-days.

(Also, never click on links on these sites...ever...never!)

Have a chat with facebook and cbc and tell them to check their website. It may be an attack/hacker that has put an automatic redirect onto the site. It is a long shot but it's the kind of stuff that is happening now-a-days. (Also, '''never''' click on links on these sites...ever...never!)
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