When Firefox launches a window opens that says a plugin for Kaspersky is not compatible with firefox. I have to close that window fefore firefox will lsunch.

I have gone into options, General, Extensions. This Kaspersky add-on is not present. Kaspersky used to be my anti virus software. I called my self deleting that software. I don't know where firefox is getting it.
Firefox is my default browser. I cannot launch links without closing the error window that comes up.
I am considering deleting firefox and reinstalling. Just haven't done that yet.
Any advice would be appreciated

Create a new profile as a test to check if your current profile is causing the problems.
See Basic Troubleshooting: Make a new profile:
*https://support.mozilla.com/kb/Basic+Troubleshooting#w_8-make-a-new-profile
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.
If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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