[Greasemonkey] Full canvas support (taking screen shots, etc) ?

[Jeremy Dunck]

On 4/25/06, Jonas Lundberg <my.name.is.hans at gmail.com> wrote:
> Does greasemonkey (fully) support using the (not quite) new Firefox
> canvas feature, that can be used for instance for taking screen shots?

JS doesn't have access to toDataUrl:
https://bugzilla.mozilla.org/show_bug.cgi?id=291218
https://bugzilla.mozilla.org/show_bug.cgi?id=245684

(Note the former is marked Fixed, but I think they really mean Dupe.)

What does "fully support" mean to you?