I also get "[ Registry ] >Key Found : HKCU\Software\Classes\Applications\updater.exe"
with both the update to Firefox 46.0.1 and with a full download from [ https://www.mozilla.org/en-US/firefox/all/ ]
Log file =Edit to remove unneed information IMHO
2 Scans
# AdwCleaner v5.115 - Logfile created 05/05/2016 at 17:33:36
# Updated 01/05/2016 by Xplode
# Database : 2016-05-04.2 [Server]
# Operating system : Windows 10 Home (X64)
# Username : rick
# Running from : K:\Add to flash\adwcleaner_5.115.exe
# Option : Scan
# Support : http://toolslib.net/forum
C:\AdwCleaner\AdwCleaner[S9].txt - [1391 bytes] - [05/05/2016 17:33:36]
########## EOF - C:\AdwCleaner\AdwCleaner[S9].txt - [1464 bytes] ##########
# AdwCleaner v5.115 - Logfile created 05/05/2016 at 17:37:34
# Updated 01/05/2016 by Xplode
# Database : 2016-05-04.2 [Server]
# Operating system : Windows 10 Home (X64)
# Username : rick
# Running from : K:\Add to flash\adwcleaner_5.115.exe
# Option : Scan
# Support : http://toolslib.net/forum
This was the only thing found
***** [ Registry ] *****
Key Found : HKCU\Software\Classes\Applications\updater.exe
Thank You Rick