If you want something more easy, there is a Google Add-On called "Table of Contents" that will allow you to number your headings.
To install this add-on:
- Click on the Add-Ons > Get Add-Ons.
- Click on the "Table of Contents" icon or search for this addon to install it
Then your Table of Contents should appear in your sidebar. Click on Heading Numbers Format menu, and choose 1.2.3
You have to reformat your document if you have an old one in order to 'refresh' the numbers, but actually the addon works very well.
I've seen the answer in this forum.
In case the sidebar is not shown, go to "Add-ons->Table of contents->Show in sidebar".
I think anyone can call their add-on "Table of Contents". So a link to the actual add-on is helpful. I'm guessing you mean this one: chrome.google.com/webstore/detail/table-of-contents/…
How is the plugin installed - per machine / browser, per document, per user on google docs? What happens if others want to edit the document?
Should we worry about the chance that the plugin can read the whole document? Or it wouldn't be able to?
Sadly, this plugin seems to be broken. It fails to install due to an authorisation issue. Are others getting the same result?