Editor Cursor Does Not Appear in Firefox using Documentation Theme

Editor Cursor is missing in the first section when the Documentation Theme is applied on Firefox 34, 35, 36.

Steps to Reproduce

1. Open up your Firefox browser.
2. Go to a Confluence Space.
3. Apply Documentation Theme via Space Tools > Look and Feel > Themes.
4. Select Documentation Theme and click Confirm.
5. Create a blank page in the space.
6. Add a section using the Page Layout button.
   
7. Type some texts in the first section.
8. Add another section using the "+ Add Section" button.
9. Type some texts in the second section.
10. Save the page.
11. Edit the page.
12. Observe the result.

Expected Behaviour

Editor cursor should appear in the first section.

Actual Behaviour

Editor cursor is missing in the first section no matter how many times you click it.

Note

For more information, please refer to the following screencast.

This could be a regression of this bug report: CONF-33922