First of all, thank you to the BleepingComputer staff and community for making this site such a useful resource.
I want to report a problem I had with Junkware Removal Tool downloaded from the site. I wasn't aware of any particular problems on my system, but I saw this tool recommended and wanted to do a scan to see if it picked up anything my other regular scans missed.
During the scan, there were a few errors shown, but I think the relevant error was "Line too long" while scanning the Firefox prefs.js.
Looking through the log, I double checked each item and discovered nearly all of my Firefox and addon preferences had been deleted. The resulting prefs.js after JRT had only 108 entries left, while my most recent backup has over 4000+ lines of entries. Many of the items are addon preferences, including extensive manual blacklists and whitelists and other settings built up over a period of years. The Firefox addons NoScript and RequestPolicy in particular seem to have extremely long user_pref values.
Thankfully, I have a fairly recent backup from a few weeks ago which seems to have worked as a drop in replacement, but I thought I should warn others and notify the developer about the issue.
Perhaps the JRT tool should make a backup of all files to be altered in case of such "Line too long" errors. Also, I'm not sure if there is already such an option, but a "scan only" setting with confirmation before making any changes would also be helpful.
Here's a truncated version of the relevant sections from the log.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Junkware Removal Tool (JRT) by Thisisu Version: 6.1.2 (02.20.2014:1) OS: Microsoft Windows XP x86 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~ FireFox Successfully deleted the following from C:\Documents and Settings\user\Application Data\mozilla\firefox\profiles\profile.default\prefs.js user_pref("extensions.requestpolicy.allowedOriginsToDestinations", "... amazon.ca|images-amazon.com amazon.ca|ssl-images-amazon.com ...