Your Firefox identified itself as version 59, which I think is nearly 4 years old now. I guess it is not updating automatically, which is unusual. What if you try to trigger an update using the About Firefox dialog as described in this article: [[Update Firefox to the latest release]]. ---- If that doesn't work, I suggest doing this in a few separate steps: ''To stay on the standard release track:'' (1) Make a backup of your profile for safety using the steps in this article: [[Back up and restore information in Firefox profiles]] (2) Manually upgrade to Firefox 68 using the steps in this article: [[How to download and install Firefox on Mac]] [Download for U.S. English: https://ftp.mozilla.org/pub/firefox/releases/68.0.2/mac/en-US/] (3) Manually upgrade to Firefox 78 [Download for U.S. English: https://ftp.mozilla.org/pub/firefox/releases/78.0.2/mac/en-US/] (4) Manually upgrade to Firefox 92 (try using the built-in updater in Firefox 78) ''To switch to the extended support release track:'' (For people who prefer fewer feature changes: [[Switch to Firefox Extended Support Release (ESR) for personal use]]) (1) Make a backup of your profile for safety using the steps in this article: [[Back up and restore information in Firefox profiles]] (2) Manually upgrade to Firefox 68esr using the steps in this article: [[How to download and install Firefox on Mac]] [Download for U.S. English: https://ftp.mozilla.org/pub/firefox/releases/68.12.0esr/mac/en-US/] (3) Manually upgrade to Firefox 78esr [Download for U.S. English: https://ftp.mozilla.org/pub/firefox/releases/78.14.0esr/mac/en-US/] Note: if you prefer a different language/locale, other than U.S. English, click the .. link on the download page to move "up" to the directory listing of locales and click into the one you want.