Posting this in hopes of raising awareness to the issue (and because it was recently reopened). The sidebar API would help open a new world of useful chrome extensions (especially tab management, such as for instance vertical side tabs). If this is something you want, please show your interest by starring the issue.
Vertical split tabs is definitely a feature that I would like (especially if it gets integrated with vimium[0]), however I am unaware of the chrome sidebar, is it this[1] or something more?
The Sidebar API is a proposal/concept for adding a sidebar surface to allow chrome extensions an alternative to injecting iframes into pages in order to display something next to a page.
With it, you could implement something like the old Side Tabs feature (that you mention), which was removed from Chrome due to "the complexity of a tree-style interface in terms of usage is beyond what most users need or want, and in terms of implementation is more than passes the cost/benefit test for building into Chrome natively as an option."[1])
I think the title to this should've been something more descriptive like "Google willing to accept Chrome Sidebar API patches" as that seems to be the main reason it was reopened.
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[ 5.3 ms ] story [ 25.7 ms ] thread[0] https://github.com/philc/vimium
[1] http://www.askvg.com/how-to-enable-new-side-tabs-feature-in-...
With it, you could implement something like the old Side Tabs feature (that you mention), which was removed from Chrome due to "the complexity of a tree-style interface in terms of usage is beyond what most users need or want, and in terms of implementation is more than passes the cost/benefit test for building into Chrome natively as an option."[1])
[1]: https://code.google.com/p/chromium/issues/detail?id=344870#c...