If you are in edit mode and try to use the Keyboard shortcut "CTRL+S" while editing the title of the page, Confluence will try to save the page as a htm file to the user computer instead of saving the Confluence page.

Steps to reproduce:

1. Create a page.
2. While in edit mode click to add a title.
   
3. Now hit "CTRL+S", instead of saving the Confluence page you will get the browser window to save the page as a htm file:
   

Workaround:

If you click anywhere besides the the title block it will work accordingly.

Notes: The issue is reproducible in the following browser versions:

• Internet Explorer 9 and 11
• Mozilla Firefox 44.0
• Google Chrome 49.0.2623.108