That's from the "tabs" permission; I'm not sure why the extension requests it, as it doesn't appear that it's required by the code (the chrome.tabs API does not require it, you only need the permission if you're reading the URL/title/favicon of existing tabs AFAIK).
Since the sole feature of this extension is pretty trivial and can be easily replaced with a bookmark, I would be honestly worried about some "hidden features".
The barely two sentence description and low resolution preview picture also don't inspire much confidence.