Raindrop is bookmarks' centerpoint for me. Native bookmarks are still useful, though. I'd prefer them autosynced to raindrop.

Single and attached to bookmarks

A feature that would allow the user to highlight text on articles and save the highlighted version.

Its great update. I've been using raindrop.io since the first launch !!!

Add bookmarks with IFTTT Integration

Making a divider to visually group your collections that belong together without having to make more subfolders. (ex: all hobbies are grouped together) Currently I have a collections titled with dashes ------------, but the icon on the side is quite distracting.

Allow saving all of the current window's open tabs links without having to through each tab and saving it individually. Likewise, one should be able to open all selected bookmarks in the add-on (each on their own tab). This is essential to easily switch between contexts or to research and quickly save a set of bookmarks that refer to a given topic.

Bookmarks should be shown on Google Search, similarly to Evernote and Papaly

Multi Authentication with Google Authenticator to safely access public PCs too because even if a public PC is infected with virus, they wont be able to login into account unless they type in 2nd authenticator access code.