There is an autocomplete=off for firefox, but it's not a valid XHTML tag, so not something I want to add in for version 8. I'm just going to have to rename all username/password fields to something else, maybe just un/pw. Something still recognizable that doesn't trigger all the autofill stuff.

On the database lockup issue itself:

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All this started happening when I upgraded to 7.53 and checked persistent connections.

Persistent connections can help on some servers, hurt on others. I'd go back to running with it off, but as Dave mentioned, you'll need to restart the webserver after disabling it.