OMG. I thought I was going nuts when it didn't work with Shift as I was used to in Chrome. I am trying to switch to Opera since Opera is supposed to be using more resources, but how are you supposed to organize your work without being able to split out tab groups?
I often have more than 50 tabs open and need to re-group the tabs by the projects I am working on or just split some out from another set if the group gets big enough to warrant it.
How is anyone using more than 15 tabs working well without that feature?
I have now installed the Chrome extension Tab Scissors -
https://chrome.google.com/webstore/detail/tab-scissors/cdochbecpfdpjobpgnacnbepkgcfhoek?hl=en - and hope that it will help enough, but really...