I'm just uploading my memory dump as you told me (I don't know why you told me to upload).
I will update MBAM (Avast has been updated this morning) and run a scan.
I will do what Vlk suggested but I didn't have much time last week-end.
I have many add-ons on FF which are : (I don't think it comes from this because I have the same problems with Chrome)
- Edit Cookies
- Firebug
- Firephp
- Foxtab
- Javaconsole (many versions)
- Gestionnaire de Session (sorry, it's a french one but I think you can understand what it does)
- Tamper data
- Unplug (The lonely which might cause the problem because it does something on the videos (Avast automatically stops when I'm opening a pag with a video)
- View Cookies
- View Source Chart
I already had Chrome before installing Avast! 5 (And no add-on on Chrome)
Don't worry for new viruses, I reactivate Avast as soon as it stops most of the time and I run a scan regularly, with MBAM and Avast.