When comparing Mosaic vs Tabliss, the Slant community recommends Tabliss for most people. In the question“What are the best new tab extensions for Chrome?” Tabliss is ranked 13th while Mosaic is ranked 16th. The most important reason people chose Tabliss is:
FOSS and has necessary features to make a great start up page. Highly recommend.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Clean, tiled interface
Mosaic displays bookmarks in a tiled layout on a changing background.
Pro Free and Open source and gets the job done
FOSS and has necessary features to make a great start up page. Highly recommend.
Pro Has a web version
Phones usually don't support extensions. A web version is a godsend, especially since it has a dedicated mobile webpage.
Cons
Con In alpha
It's still early in development and parts of it may be buggy.
Con Essential features only
This extension features a few but useful features only. But it is a great new tab page nonetheless.
P.S. If you wanna add new features, you can just fork the source code if you are that kinda guy (its FOSS).
Con Limited customization
Widgets can't be customized a lot.