getElementByID() is broken (due to namespace quirkiness?); it seems to always return null. This is a major problem as it prevents one from writing JS code in .xul files that dynamically modifies the UI. For example, I need to do this in order to do a progress meter and the status text.

Fixed.

Reopening this as it needs to work for non-XUL elements also (e.g., so the status text can be changed).

Fixed again.

Looks OK now (based on code sent me via email; if it doesn't get checked in, you'll hear about it).