Q: Uninstall Offers4U

Not sure if thats a plugin or extension but we can find out...  Safari > Preferences > Extensions if u see it there remove it, if not then /Library/Internet Plug-Ins (move it from there into trash) / Also check ~/Library/Internet Plug-Ins.  Make sure Safari is not running.

I'm running into this problem with Chrome, currently. The ads don't pop up in Safari  or Firefox, so it's incredibly frustrating. I had hunted down anything that I possibly could've installed, and the stupid things still keep popping up on Chrome. And like, with you, every removal possible removal program is only compatible with Windows... ugh.

See:

Eliminating browser redirects and advertisements

Please be sure to check back in with the results. If you find the cause, please let us know, as Offers4U isn't something I've heard of affecting a Mac before. If you need further help, let us know what you have found.

i have the exact same issue.  i haven't found a way to remove it.  did you have any luck?

I have this also - I installed Mavericks and then had to have my hard drive reformatted (something different). I use Firefox and I suspect it's one of the add ons but I'm having a terrible time. It's so annoying and I feel invaded! Hah. I've tried reading your tome on Malware but it's intimidating. I would love to get rid of this. What do you think of MacScan? Thanks!

Frankly, MacScan is junk. See:

MacScan disappoints

Mac anti-virus testing 2014

As for a solution, note that since I last responded on this topic, I've significantly updated the adware solutions on my site, due to an explosion of Mac adware. See my Adware Removal Guide.

(Fair disclosure: My site contains a Donate button, so I may receive compensation for providing links to The Safe Mac. No one is required to donate.)

I just discovered this spyware last night. It' sonly affecting my chrome browser. Go to settings > extensions > and delete all the obvious spyware. Everything you know you never authorized

Unfortunately, there is nothing out of the ordinary there.  I have deleted anythjng suspicious and still have it. Ideas?

I don't recall what extensions I killed. Give us  ascreen shot of what you have in your extensions list. Have you reloaded your browser window yet?

I had this start happening to me in the past couple of days using Firefox.  I went into Add-ons>Extensions> and removed some sketchy Shopping extension that I never installed.  It seems to have done the trick. 

here you go.  i dont have any extensions that are suspect and have deleted any programs that could have been part of the install.  ideas?

Not all adware shows up in your browser's extensions. Not all ad problems are even caused by adware. Some can be caused by a compromised network.

See the Adware Removal Guide I referred to earlier. It will help you solve the problem.

(Fair disclosure: The Safe Mac is my site, and contains a Donate button, so I may receive compensation for providing links to The Safe Mac. Donations are not required.)

i am forever in your favor.  read before but didnt catch the part to look in the root/plugins directory (vs my profile). Think the culprit was flip4mac.  You have no idea how you made my day.  been trying to fix this for months.