hello cin993, there is no preference that can control this behaviour individually. you can only disable it together with the protection from malicious addons and crashy graphics drivers: http://kb.mozillazine.org/Extensions.blocklist.enabled

I don't understand- I'm unclear about your reply. This warning is rather new, past week or so it has started to pop up as an "infobar" i believe its called.

And I'd like to get rid of these warnings or disable them all together. I don't want Adobe Flash and I don't want to be warned about it being outdated... Your thoughts? Thank you very much...

the best way would obviously be to keep your plugins updated: https://www.mozilla.org/plugincheck/

if you don't want to have flash present at all on your system (though this will currently break the functionality of quite a few websites), you can set it to "never activate" in firefox > addons > plugins or totally remove it from your computer through the windows control panel > programs section.