How to Disable Accesskeys in Firefox
This took way too long for me to Google, so here you go:
If you need to disable accesskey support in Firefox, because, say, you’re learning vimperator but would still like to visit wikipedia without having the rage, set ui.key.contentAccess to 0 in your about:config (you’ll also need to make sure ui.key.generalAccessKey is set to -1, but it already was for me).