Hello!
Thanks for the great extension - just what I needed :)
A few things I've noticed on first use:
1) When you enable Google Docs sync, after the 'grant access' page, you get a completely blank page with the word 'Redirecting....'. This doesn't do anything, until you click it, at which point it closes. Not sure where the issue is, but similar extensions (such as Pig Toolbox) that do the same thing don't give this blank page. Sync setup seems to have worked though.
2) A 'Move to top' button next to each search engine entry in the Options screen would be useful (and probably a 'Move to bottom' as well). Perhaps a double arrow as the icon? Saves chasing the entry up to the top one line at a time.
3) The red 'Options saved' notification bar that is briefly shown when saving changes is positioned beneath the Google+ box at the bottom-right, so in some screen sizes the text is obscured. Probably moving the Google+ box down a bit will resolve this.
Thank you!