I tried it for a while; I think the browser extension needs work, but my main gripe with it is that I don't really have a use case for it. I've got a list of browser bookmarks but I don't really do much with it other than the frequently accessed ones. I get on with my day job and don't really spend too much time on more 'academic' work, i.e. gathering resources and collating them or whatever the use case for building a collection of bookmarks is.