Developer reply by Daniel Dawson
Rated 3 out of 5 stars
Doesn't want to fill in password at npr.org
This review is for a previous version of the add-on (2.9.1-signed).Please look at the support forum at https://groups.google.com/forum/#!forum/ddawson-addonssupport
In short, SPE has never claimed to fill passwords. That's still left as the job of Firefox, as to do otherwise would turn SPE into a password manager, not a password *editor*. If Firefox doesn't do that properly, you'll need other solutions, one of which I suggest at aforementioned support site.
If you want to complain about this, please complain to Mozilla developers.
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