For Mac OS users, there is a system setting that may not allow you to tab onto several types of elements in a web page. To change this setting:
by Google Tips
Posted on October 18, 2016
One big thing to remember about Google Apps is that there are loads of “add-ons” available. For example, I recently needed to print some envelopes using Docs and couldn’t find a template for a new document or the correct paper size in the Page Setup. So, naturally, I “Googled” the question of “how to print envelopes using Google Docs”.
Turns out you need an add-on called “envelopes”. Clever name. When you are in Docs, there is button in the toolbar for “Add-ons”:
You search for the add-on you want in the search box, then select it and add it. Nothing special to do: no administrative credentials needed, no downloading or installing, and no secret hand shakes.
Once you have your envelopes add-on, go back to the same menu in order to use it.
I’d suggest opening the size of envelope you plan to use most, typing your return address and place holders for the addressee. Then guess what? You don’t have to save it, because you already did. Cool stuff.