The wise guy that has approved this automatic update did not think a little on all the security add-ons that will be disabled. so i would not be surprised if thousands of computers got infected today.

I suspect that Avira is correct - but it is inconsequential where it is sitting.

That "trojan" is in the cache - it ain't gonna hurt you unless you go poking around in the cache.

If it bothers you just being there, just clear the cache.

Thanks for your help!

@the-edmeister: Nope, does not work. Still there.

Any other ideas?

Are you still using this profile?

It was created via a refresh in May 10, 2017 (1494393169451).

You can find links to each registerd profile folder on the about:profiles page.

You can clear this folder yourself if you are worried about this alert, but as written above, files in the disk cache normally can't do much harm.

• https://support.mozilla.org/en-US/kb/Firefox+cache+file+was+infected+with+a+virus

@ core-el: Thank you very much! This time clearing the folder was successful!

I do not understand what it means whether I still using the profile. I am not quite good at these things. Sorry!