I have Adblock Plus installed and activated and still get "Critical Firefox Update" messages. How can I stop them?

Hi, this is a problem that is difficult to overcome, but some users seem to have more success with https://addons.mozilla.org/en-US/firefox/addon/ublock-origin so you could try that instead. Incidentally, you have a very old version of Shockwave Flash - which can cause problems, so it should be updated on your machine - * [https://get.adobe.com/flashplayer/otherversions/ Install Flash Player] - take care to deselect any optional offers!