can i add adblock plus, malwarebytes, mcafee and ublock to firefox

Hi, after you install Firefox from https://www.mozilla.org/firefox/browsers/, you can go to the Mozilla Add-ons site at https://addons.mozilla.org/ (in Firefox) and install uBlock Origin and Adblock Plus, although probably there is so much overlap between them that you only need one of them. Malwarebytes and Mcafee distribute their add-ons through a different method, either on their own websites or through a control panel in your locally installed software.