Yes, that is still a threat, and I would love to see SGP's algorithm make it into native addons for Firefox, Chrome, etc, triggered by a hotkey or toolbar button. However, my initial attempt fell flat when trying to wade through XUL, just didn't have enough time...

And if you're really that worried about a new site, the mobile version can be saved to your local disk and opened in a separate tab, and then copy-paste the generated password into the site in question.