I've really come to depend on the multi-account containers. It's a much better alternative to using profiles for managing online accounts.

@Albert Kolkin:
I use it with multiple gmail accounts. The secret is to press and hold the "+" button so that you can select the container that you want to use. Then you can go to gmail.com using a bookmark for example. Since there is only one url for accessing gmail you can't use the always open the bookmark in a particular container feature like you were trying to do.