The Bugzilla bug-tracking system. Note: This is not the place to request configuration, permission, or account changes to this installation of Bugzilla (bugzilla.mozilla.org). File such changes under the appropriate component in the bugzilla.mozilla.org product.
General issues having to do with the user interface. This includes both presentation (how it looks) and behavior (how it works) but not functionality (what it does), which should be filed in a function-specific component like Email Notifications or in Bugzilla-General. Examples of bugs you might file here include column label "Pri" is confusing and take anonymous users to the simple query page by default but not need way to filter for requests with no requestee.
As a general rule, bugs that affect only a single Bugzilla web page or can be fixed with changes just to templates probably go in this component, while bugs that affect multiple pages or fixes to Perl code probably go somewhere else.