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by brlewis 3995 days ago
From the API proposal doc:

Additionally, we’ve seen numerous extensions create sidebars by injecting HTML content into the current page. It is likely that the majority of sidebar extensions would use a native sidebar if available. Here’s a sample of some of our favorite sidebar extensions...

Some of these tools charge over $5,000/yr/seat and have hundreds of large corporations like Facebook, eBay, Salesforce, Pinterest, Twitter, and Netflix using their software, which demonstrates the immense value that can be provided by a sidebar.