I noticed that on a recent thread I posted a particular word (in this case the word pregnancy) which was coloured and underlined, I press on this word and a page entitled 'Visitor's Survey' popped up.
Is this new feature now being introduced by AnswerBank?
I think AOG uses firefox and from previous posts has a fairly good idea of which extensions he normally has installed.
So, AOG, just have a look though your installed extensions and if you see any new ones disable them to start with, if that removes the advertising links then you can remove that extension totally.
Press CTRL+SHIFT+A to bring up the add-on page in firefox, click on the extensions on the left hand side and have a look down the extensions to see if anything looks likely to cause it...
Although if it's happening on some sites only then it can be the site doing it, but if it's happening on AB then it's a browser extension.
It may do nothing to overcome your problem, but it'll Not do any harm.
Click open Firefox 'Help' then go down the menu to 'About Firefox'. You can then update your Browser from that point and, during the process, Firefox should check that your 'Add-ons' are compatible with your Browser.