Beyond the default Firefox browser hot keys anything other then that is either addon or 3rd party apps to make those changes.

For Mac, the article still lists Control + Return: https://support.mozilla.org/en-US/kb/keyboard-shortcuts-perform-firefox-tasks-quickly#w_miscellaneous_2 So it should work. However, there is a setting to disable it. Could you check: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. ''More info on about:config:'' [[Configuration Editor for Firefox]]. ''The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.'' (2) In the search box in the page, type or paste '''ctrlCan''' and pause while the list is filtered. Firefox should show one match (please ignore the line with Boolean Number String). (3) If the '''browser.urlbar.ctrlCanonizesURLs''' preference has a value of false, double-click it (or click the Toggle button or Reset button at the right end of the row) to restore the default value of true * If you changed that, any improvement? * If the false comes back after your next Firefox restart, we need to help you hunt down the culprit, possible a user.js file. * If it shows a lock icon at the left and cannot be changed, we need to help you hunt down an Autoconfig file or possibly an Enterprise Policy.