Yahoo Search has hijacked all my internet browsers (Safari, Firefox). How to remove the adware/malware? Today I installed a program that I'm familiar with and that I have used before called Filezilla using SourceForge. I've never had a problem with it before, and I only uninstalled it because I had no need for it. So I moved to install it again and thought it was strange it kept asking for key permission (so I said no). All the sudden my fireox browser disappeared I had some crapware installed I had no interest in, plus another unpleasant surprise: whenever I load firefox OR Safari Yahoo search comes up even though my default for Safari is google search. How do I fix this? I'm trying to delete the program it came from but it says that it's 'in use', but when I pull up the task manager all that shows up are finder and Microsoft Word. Any word on how I can delete the covert adware/malware?
So after downloading Vuze a while back, I wound up with api.mybrowserbar redirects and a bunch of stuff pointing at some thing called Spigot, deterministically finger banging my bandwidth and internet experience in general.

Sorry, this assumes some knowledge of the command line and file structures.

The solution, grep is your friend.

Open Terminal and navigate to /Users/YOUR_COMPUTER_USERNAME/Library/Application Support/Google/Chrome

YOUR_COMPUTER_USERNAME must of course be replaced with your computer username, you can retrieve it by running the whoami command in your terminal.

grep -rnw '.' -e 'spigot'
and
grep -rnw '.' -e 'api.mybrowserbar'

get in there and remove that shit.

In the most annoying case, their genius software made itself the default restart page for whenever chrome unexpectedly crashes. This little tidbit is located deep inside a sort of huge JSON blob at 

/Users/YOUR_COMPUTER_USERNAME/Library/Application Support/Google/Chrome/Default/Preferences