Windows 10: Firefox Quantum suspicious activity

Discus and support Firefox Quantum suspicious activity in Browsers and Email to solve the problem; Hi. My Firefox browser auto-updated to quantum last night. I am willing to give it a try, even thought it doesn't support the addons I use. My issue... Discussion in 'Browsers and Email' started by sonamsopmist, Nov 17, 2017.

  1. Firefox Quantum suspicious activity

    My Firefox browser auto-updated to quantum last night. I am willing to give it a try, even thought it doesn't support the addons I use. My issue is that every time I run FQ my internet security software (ESET) notifies me multiple times about two addresses its blocking. Could somebody explain what those are (malicious or not) and how I can prevent Firefox Quantum from doing that.
    Posting screen shots of the addresses.
    Notifications are in greek, so I translated
    thanks in advance

    sonamsopmist, Nov 17, 2017

  2. Firefox replaced by Firefox Quantum

    > This is a virus, called 'Quantum'

    firefox quantum - Recherche Google

    > I can't seem to uninstall this 'Quantum' Firefox, and when I try to install the real Firefox, my computer doesn't seem to recognise the exe file extensions

    Firefox Support

    Firefox Help

    Don Varnau, Nov 17, 2017
  3. vj000000 Win User
    Defender utilization extremely high since Firefox Quantum update

    Hi Darlene,

    Thanks for your reply.

    I didn't try your suggestion because I was having such horrible performance problems with the new Firefox Quantum release.

    A little while ago, I uninstalled Quantum from my ThinkPad E545 and reinstalled the previous good release (56.0.2) that I had been running. Performance (cpu & mem usage) has returned to acceptable levels. And Windows Defender is no longer actively running.
    I don't even see it running in the background in Task Manager.

    Going back to a previous Firefox release may not be the best solution but it was the easiest workaround. I'm going to uninstall Firefox Quantum from my desktop PC which has the worst problem and which I'd originally reported above. I'll add an update/reply
    once I've done that.
    vj000000, Nov 17, 2017
  4. simrick Win User

    Firefox Quantum suspicious activity

    I don't know if this is your problem, but I will tell you what I've seen on several systems from this Quantum update:

    Common Situation:
    • Systems themselves are 64-bit, originally using FF 32-bit
    • Systems were auto-updated to 64-bit FF
    • Systems were auto-upgraded to 64-bit Quantum

    Problems started showing up with AV blocking FF-related files/executables/connections

    What I found was, the FF auto-update from 32-bit to 64-bit FF, left some FF "active" executables in the Programs Files (x86) folder, which the 64-bit version was calling. This was creating the AV warnings.

    I had to completely remove all FF instances from the system, clear it out of the registry, and reinstall Quantum clean. This solved the problem. Maybe it will work for you.
    simrick, Nov 19, 2017
  5. Thank you, I do have to try that I guess. Or maybe I will go back to Firefox 56. For the time being Quantum doesn't support DTA/DTAoc, or flashgot. Bulk MD is totally useless. I can't operate like this *Sad. I'll try quantum again in a month or so.
    sonamsopmist, Nov 19, 2017
  6. simrick Win User
    Good luck. Cheers!
    simrick, Apr 5, 2018

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