Is there a tool that can sync bookmarks and addons across browsers? Especially now that Mozilla is going to support the same addons? Something that syncs things

Is there a tool that can sync bookmarks and addons across browsers? Especially now that Mozilla is going to support the same addons? Something that syncs things on an ongoing basis, not just once. I think FF is great but asking people to use more than one browser, yet manually sync the bookmarks and addons is asking for way too much. Even just for bookmarks this would be great. The functionality is 99% of the way there (one time sync works). Personally, I just think Mozilla no longer cares if people use its products. If it did, it would make using them a lot easier and more convenient.