Two links advertising Norton open whenever I click on show unread posts since your last visit and show new replies to your posts. I’ve read the whole page about Norton but with exception of clicking on a Norton email address it doesn’t show anything else that would let me stop opening the links.
Just guessing but are you by chance using Norton DNS for your DNS provider? That would be the only explanation I can think of.
I dont know use it so I wouldnt know how their service opperates but then again if it only happens in firefox and not IE then I dont know what could be causing it.
disable all add ons. if the problem is still there you have a browser hijack issue.
Run a Malwarebytes scan to see if that finds the problem.
You should dump a most of those add ons, you have several items there that do the same job and avast covers almost all of them.
Adblock Plus
Avast Online Security
Colorful Tabs
Do Not Track Me remove
Dr. Web remove
Ghostery remove
McAfee Site Advisor remove
Track Me Not remove
Webutation remove
WOT remove
The other tool to use to remove this problem would be this >>> ADWCleaner
After disabling all add-ons this comes up twice whenever I click on show unread post, show replies to your posts. It also shows up in my Firefox tool bar.
Captured the full page but got an error message saying the file is to large.