In any case, given that my comment is being treated like any other noise, here's a few words to make it distinguishable...for whatever it is worth and for whoever that cares.
1. Whatever the heck is happening with Tags in bookmarks? Is anyone working on adopting any standards? People don't realize but holding up your bookmarks in FF via Tags is a death trap. Chrome apparently is not willing to support the tags and you will be stuck with FF if you care deeply about Tagging your bookmarks. Besides, FF for long has stopped innovating (read developing) their Bookmarks Manager.
2. Speed: No matter what anyone says and no matter the reasons, Chrome is certainly speedier. Besides, in my example (I use only two add-on and limited number of tabs) my hard drive spins and makes noise whenever I am on FF and it is absolutely silent when I am on Chrome (please don't blame my profile for it, I use multiple profiles and I know how to clean etc).
3. Syncing on Chrome is as straightforward as it should be and they also encrypt data.
Just a few on top of my list.
Firefox Sync is also straightforward (and syncs with Firefox for Android as well) and is also encrypted.
Unfortunately, didn't really get any momentum (mainly because there's just a long pipeline of things that are higher priorities), but maybe it'll go somewhere in the future. I agree that it's a weak point.