I know how annoying that can be! Actually this is a malware attack and it is
not that simple to remove. If your browser is infected with a malware similar
to mine (in my case, firefox was the infected one) , try these steps.
1)
Uninstall firefox : This is optional. But it is
always better to start from a clean slate. If you are uninstalling , then You
need to take a backup of your bookmarks :)
2)
Perform a disk clean up : Even this is optional.
But I would suggest to do this as this will clean up the temporary files. I
used the windows Utility in Start->All programs->Accessories->System
Tools ->DiskCleanUp
3)
Install malwareBytes from https://www.malwarebytes.org/ : This
is an Anti-malware application which is quite powerful in detecting and
deleting malwares from your system. You can download the free version and
install it . Run a scan after installing the software , and I was quite
surprised to see the list of malwares that got deleted during the scan .
Now install the firefox (if you have
uninstalled,) and you no longer will see that old pop up again J
Tips for Safe Browsing :
1)
Always download softwares from original
websites.
2)
You can install browser add-ons like adBlock
Plus which helps you block unwanted pop ups while browsing.
Deleting temporary files using DiskCleanUp(or
any similar applications) is always
recommended 