Pop-ups in Firefox

Can someone please tell me why and how to get rid of these pop-ups.
they appear every time I move cursor over certain 'things'
I am using FF 27.0.1 and Win 7.

Hello, i believe this is what you are experiencing:

TDL4 rootkits ,bootkits which will infect your Master Boot Record and malicious browser add-ons are known to cause this malicious behavior.

I recommend that you download a Anti-virus and preform a FULL SCAN. This may take a few hours depending on your system and space.
I reccomend:
AVG Free | Antivirus | Free Virus Protection
Norton from Symantec: You Need The Speed
AVAST 2014 | Download Free Antivirus Software for Virus Protection

If these option fail please download and follow steps:
TDSSKiller Rootkit Removal Utility Free Download | Kaspersky Lab US
1, Start you computer in safe mode.
2, Before you can run Kaspersky TDSSKiller, you first need to rename it so that
you can get it to run. To do this, right-click on the TDSSKiller.exe icon and select Rename.
Edit the name of the file from TDSSKiller.exe to iexplore.exe, and then double-click on it to launch.
4, Kaspersky TDSSKiller will now start and display the welcome screen and we will need to click on Change Parameters.

5, In the new open window,we will need to enable Detect TDLFS file system, then click on OK.

6, Next,we will need to start a scan with Kaspersky, so you’ll need to press the Start Scan button.

7, Kaspersky TDSSKiller will now scan your computer for Malware infection.

If all this fail please do contact me, And we will sort this out!

For help on booting in safe mode: Safe Mode

Harribo2014

I also recommend that you look at you installed programs and anything you don't need or don't remember installing uninstall. However make sure that you check what you are uninstalling or you may damage your PC.

whs said:

Looks like some Adware. Try Adware Cleaner to get rid of it.

Cheers for the additional option! :)

Have downloaded and scaned with Adware, tell me I have 1,186 threats and 643 safe,
then when I go to remove threats it tell me I have to buy, which I am not going to,
so still got no where.

I need anybody's help, just getting mad with myself, apologize,

have done the free one, now what, still don't know what to tick and not tick

Well what ever I have done it has worked, I no longer have those 'icons' where when I hover over them a window opens,
not sure what I did, but in Control Panel, add and remove, I found a program called 'Safeweb' which was the word that kept showing up on those pop-ups, so removed that, rebooted, and it has gone,

so either it was that or Adware I don't know, but am keeping fingers crossed.
and again sorry if I came over a bit 'ratty' but thank you all for your help.