Rated 5 out of 5 stars
This extension doesn't modify your Gmail options at anytime. This review is inaccurate and is probably in regards to another extension of some sort or the person just the settings on their own. I'm not sure where this person got the idea that Gmail Manager would modify your IMAP settings but that is not true. This extension provides mail updates along with snippets of new mail (and many more features) without any account modification.