If I try to use the API sandbox on enwiki directly from a link that contains the query, e.g.:

http://en.wikipedia.org/wiki/Special%3aApiSandbox#action=query&prop=categories&format=json&clshow=!hidden&cllimit=10&titles=New%20York

then most of the fields are set from the URL, but not the titles parameter: the field on the form stays empty.

If I then change the URL in my browser, and hit Enter, a Loading animation is shown and now all of the fields (including titles) are set properly.

But it doesn't seem to work when someone uses the URL directly.

I'm using FF 14.0.1 on Win 7.

Version: unspecified
Severity: minor