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i'm getting a message wich says"Mozilla Security has found critical process activity on your system and will perform fast scan of system files" in a dialouge box when i open any link from google in a new tab .

  • 18 replies
  • 147 have this problem
  • Last reply by silkphoenix

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when i close the box, a new page appears which says firefox security alert and starts scanning and then recommends me to install certain things. the link of the page which appers for scanning is

after the scan, it shows lot of threats on my computer and the site asks me to install certain software's that Mozilla recommends . however i saw that it was scanning in my C drive . But my main drive is D. so i doubted..

Modified by the-edmeister

All Replies (18)

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Don't answer that pop-up or you will be infected by malware. What you see is only an animation and not a real scan. The results are meant to persuade you to buy and download software. If you want to perform a malware scan then do that with known and trusted programs.

Make sure that you update each program to get the latest version of the database before doing a scan.

See also "Spyware on Windows": and What to do when searches take you to the wrong search website

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thanks for the advice cor-el. i'll do that..

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After getting the message "Mozilla security ..." I searched my system by malwarebytes (quick) - no problems found, then by Spybot S&D -- no problems found, now, while searching once more witch malwarebytes (but full search now) I get the message "Mozilla security ..." again.

It looks as if neither malwarebytes nor Spybot finds this malware.

Modified by Hermandl

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Do you get that pop-up while you are in Firefox?

Clear the cache and the cookies.

  • "Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
  • "Remove the Cookies": Tools > Options > Privacy > Cookies: "Show Cookies"

You can also delete sessionstore.js and sessionstore.bak in the Profile Folder to remove stored data from the previous session.

  • Help > Troubleshooting Information > Profile Directory: Open Containing Folder

If you see files sessionstore-##.js with a number in the left part of the name like sessionstore-1.js then delete those as well.


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I got this pathetic message, but knew it was false, as security messages are not sent to you from an internet page. I closed it using the task manager and ran a McAfee scan. However, I worry that somthing might have been downloaded onto my computer. Does closing the pop-up give you malware?

Note that I did not respond to the pop-up and closed the webpage as well.

Modified by Atlas

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Try re-installing your Mozilla. it worked for me.

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just by clicking on ok in the pop-up, my computer gets infected? i didn't download the program, but i saw all those threats and everything on my page.

Modified by casualway

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please, help me

Modified by casualway

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No, you only get infected if you download and run the .exe program and your anti-virus software didn't catch it.

You will see that same animation every time that you visit such a web page that hosts such an infection.

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ok, thanks.

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I clicked on where it said "protect" and then when it wanted me to download a program I realized it was a fake and deleted it, but could it still have installed malware or a virus/trojan on my computer if I didn't download the program, since I did click on "protect?"

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I ran my antivirus afterwards and it didn't show anything, but could it have missed it?

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I also asked how to restore my "Refresh" icon/button. It disappeared. Does anyone have an answer?

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DottyO -- Did you run several anti-virus/spyware programs or just one? It's recommended you run a few since each one catches different kinds of viruses/spywares.

I think you are using FF4 -- The "Refresh" button has been incorporated at the far right end of the address bar. If you want to put it back somewhere in the Toolbar, you can do this:

View > Toolbars > Customize

and DRAG the "Refresh" button into the window, then drag it back out to wherever you want in the Toolbar.

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Some useful tools for supplemental scans are:

Malwarebytes' Anti-Malware:


(Actually, I see these were posted in the first reply in this thread.)

Modified by jscher2000

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Thank you!

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I don't have FF4 because when I tried to update to that, I got the msg. that it was not available on my server, whatever that means.

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DottyO -- I replied to your other post:

and it showed that you have FF4. Go to: Help > About

and it'll show you what version do you have.