User-Agent: Opera/7.54 (Windows NT 5.1; U) [en] Build Identifier: a bit similar to #280166 but not the same. (I love this great feature of opera!) When going back to a previous form-submitted pages (via POST method), the data should never be re-sent again without hitting refresh; or at least there sould be an option in setup to use this method. In that case the page would be shown from cache exactly as it was earlier. It saves a lot of time on badly organized/coded web pages, plus helps testing pages. Reproducible: Always

*** This bug has been marked as a duplicate of 160144 ***