I just did a quick and dirty test to confirm the above: in a live installer session, I replaced the /usr/bin/sensible-browser binary by a symlink to /usr/bin/xdg-open, and clicking the "release notes" hyperlink did open the release notes in firefox, as expected.
I just did a quick and dirty test to confirm the above: in a live installer session, I replaced the /usr/bin/ sensible- browser binary by a symlink to /usr/bin/xdg-open, and clicking the "release notes" hyperlink did open the release notes in firefox, as expected.