We have just updated the Clip to DEVONthink Safari extension and bookmarklet to version 1.1. The new version fixes a number of bugs, e.g. adding parts of the bookmarklet code when printing a web page as well as a bug preventing log-ins to password-protected web sites. If Safari does not offer you the update, please visit the Download Extras page and download the latest version. The bookmarklet is always loaded ‘live’ and so up-to-date when you use it the next time.
In addition we have added a Firefox extension. Please download it, too, from the Download Extras page. To add a keyboard shortcut to the Firefox extension, use System Preferences > Keyboard > Application Shortcuts.