I mostly browse from
https://www.flyertalk.com/forum/usercp.php click into threads or forums and then hit the back button to return to usercp.php
Something has changed in the last week or so that seems to be turning HTTP GET requests into POST requests and when I click back I get:
...and when I click on refresh:
To display this page, Firefox must send information that will repeat any action (such as a search or order confirmation) that was performed earlier.
...indicating that the previous request for usercp.php was a POST request and not a GET request.
Any idea what might have changed?