Does this sound like what you are seeing right now? You see pop-up advertisements from sender.contentjs.com in a new tab while browsing at websites that typically don’t advertise in pop-up windows. The pop-ups manage to escape the built-in pop-up blockers in Google Chrome, Mozilla Firefox, Internet Explorer, Safari or Opera. Perhaps the sender.contentjs.com pop-ups appear when clicking search results from Google? Or does the pop-ups appear even when you’re not browsing?

Here is how the sender.contentjs.com ad tab looked like on my computer:

After a short while, I was redirected to another site that showed the actual ad.

If this sounds like what you are seeing on your machine, you almost certainly have some adware installed on your computer that pops up the sender.contentjs.com ads. There’s no use contacting the owners of the site you were browsing. The ads are not coming from them. I’ll try help you to remove the sender.contentjs.com pop-ups in this blog post.

Those that have been following this blog already know this, but here we go: Recently I dedicated a few of my lab computers and deliberately installed some adware programs on them. I’ve been tracking the behaviour on these machines to see what kinds of advertisements that are displayed. I’m also looking on other interesting things such as if the adware auto-updates, or if it installs additional unwanted software on the computers. I first spotted the sender.contentjs.com pop-up on one of these lab systems.

sender.contentjs.com was registered on 2015-05-11 . contentjs.com resolves to 188.165.55.191 and so does sender.contentjs.com.

So, how do you remove the sender.contentjs.com pop-up ads? On the machine where I got the sender.contentjs.com ads I had MedPlayerNewVersion, Movie Wizard and istartsurf installed. I removed them with FreeFixer and that stopped the sender.contentjs.com pop-ups and all the other ads I was getting in Mozilla Firefox.

If you are wonder if there are many others out there also getting the sender.contentjs.com ads, the answer is probably yes. Check out the traffic rank from Alexa:

The issue with pop-ups like this one is that it can be initiated by many variants of adware. This makes it impossible to say exactly what you need to remove to stop the pop-ups.

Anyway, here’s my suggestion for the sender.contentjs.com ads removal:

1. Review what programs you have installed in the Add/Remove programs dialog in the Windows Control Panel. Do you see something that you don’t remember installing or that was recently installed?
2. How about your add-ons that you have in your browser. Anything in the list that you don’t remember installing?
3. If that did not help, I’d recommend a scan with FreeFixer to manually track down the adware. FreeFixer is a freeware tool that I’m working on that scans your computer at lots of locations, such as browser add-ons, processes, Windows services, recently modified files, etc. If you want to get additional details about a file in the scan result, you can click the More Info link for that file and a web page will open up with a VirusTotal report which will be very useful to determine if the file is safe or malware:

   

Did this blog post help you to remove the sender.contentjs.com pop-up ads? Please let me know or how I can improve this blog post.

Thank you!