Having something "solved" does not mean there is no space left for different approaches or sheer competition.

And seeing people putting effort into something and delivering software is at least one indicator that the original problem is not solved in the eyes of some...

Indeed, despite the fact that Chrome/Chromium has built in bookmark and password sync, there's plenty of room for competition. Maybe some people don't like the fact that you have to have a Google account for the built in syncing, maybe others just don't feel they get what they want out of existing solutions.

I certainly look forward to trying this out.

Bookmarks are not solved.

My bookmarks constitute my entire knowledge-graph, and one of the scariest things to me on the horizon is Google Chrome's new "Material Design" based, card-based, Bookmarks. <shudder>

xmarks need an account, and I've had an unfortunate data corruption experience with them.

Here's my stand-by solution for the day Google Chrome switches off the classic (i.e. current) Bookmarks Manager... and yes, they're better together:

http://tempr.org/54f653e645cf2.html

This is true but it seems like Xmarks Chrome extension has gone down hill ever since Lastpass.

Agreed. The Xmarks Chrome Extension is slow to update, sometimes doesn't update and cannot keep open tabs synced properly.

The extension itself hasn't been updated in close to a year. March 10, 2014.