''<p>creativegeniuswab [[#question-1512728|said]]</p>'' <blockquote>Does firefox still support Mac os 10.11.6 </blockquote> No. Firefox 116.0 and later including the current Fx 138.0.4 Release and Fx 128.10.1esr requires macOS 10.15 (ten.fifteen) or later to run. Firefox 115 ESR currently at 115.23.1esr requires macOS 10.12, 10.13, 10.14 at minimum to run. For the old macOS 10.9, 10.10, 10.11 the last version of Firefox to support was the old Firefox 78.15.0esr. https://support.mozilla.org/en-US/kb/firefox-mac-osx-users-esr https://support.mozilla.org/en-US/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support If your hardware allows you to update your macOS to 10.12, 10.13, 10.14 then you would be able to run the Firefox 115 ESR. which can be downloaded at https://www.mozilla.org/firefox/all/ (will not run on your 10.11)