My organization is stuck on Selenium 2.53.1, and we test using compatible Firefox 46.0.1.
I recently accidentally ran a test with Windows 10, Selenium 2.53.1 and Firefox 61.0.2, and the test ran fine. This was completely unexpected.
Has anyone else tried this? I imagine even if it worked for this one case, it wouldn't be recommended in general, though tempted to try a run against our whole test suite.