Hello,
Google docs is verry accessible with orca and
firefox.
You do need to enable google docs accessibility support by
pressing ctrl+alt+z.
I have used both documents and spreadsheets for my job and I was
impressed how much awesome the web app experience might be.
For making some real use out of this combination you need to
look for google docs keyboard shortcuts and get used to those
you think might be usefull for your tasks.
For example there are alt+shift+f, alt+shift+e for jumping to
the menus.
I can't remember more of them but if you are unable to find it,
I will find it for you.
Greetings
Peter