My pop up blocker is on,but I continually get pop ups. (The type that flash,and talk. )
Certain websites seem to revert back to HTML mode/act like my java is turned off.
In the middle of loading,Firefox will lock up for 30 seconds or more,then resume loading.
Do a malware check with some malware scan programs.
You need to scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of the database before doing a scan.