Please do the following:

• Update to Firefox 30, Update Firefox to the latest release
• Scan for malware, Troubleshoot Firefox issues caused by malware
• Install www.adblockplus.org

Also this is a list of my installed plugins.

Installed Plug-ins

   Shockwave Flash 13.0 r0
   Adobe PDF Plug-In For Firefox and Netscape 11.0.07
   Google Update
   McAfee MSC FF plugin DLL
   5.1.30214.0
   VLC media player Web Plugin 2.1.3
   Next Generation Java Plug-in 10.51.2 for Mozilla browsers
   NPRuntime Script Plug-in Library for Java(TM) Deploy
   The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
   PriceGong - Price Comparison
   NPWLPG
   npapicomadapter
   The plug-in allows you to open and edit files using Microsoft Office applications
   Office Authorization plug-in for NPAPI browsers
   Windows Presentation Foundation (WPF) plug-in for Mozilla browsers

When I update Firefox will it delete my settings? Also when i install that software will it mess up my computer?

No it will not. We need to make sure you don't have any malware on your machine, make sure you are using the latest Firefox version and then install an ad blocker so then you don't have to see anymore ads.

And for the update, will it keep my original settings?

Yes it will.

To remove pop-ups from Mozilla Firefox, you can try the below methods:

1 – Scan the browser with antivirus program 2 – Update your Firefox Browsers 3 – Run a malware scan

Or you can go to settings and follow the step mentioned in this post – How to block Pop-ups in Firefox