As current opera is based on chromium, there is also possibility to install chromium based extensions.
But theres is one issue (maybe only in latest builds?)

As I tracked error (can be seen via inspecting) the problematic line is
|
chrome.tabs.query({currentWindow: true, highlighted: true, windowType: 'normal'}, function(tabs) { |
It doesn't return any active tab on Opera, that is any
highlighted tabs.
If highlighted is changed to active:true, then it seems to work just fine - tested with Atom editor.

As current opera is based on chromium, there is also possibility to install chromium based extensions.

But theres is one issue (maybe only in latest builds?)
As I tracked error (can be seen via inspecting) the problematic line is
chrome/scripts/controllers/model.js
Line 142 in 5802ce2
It doesn't return any active tab on Opera, that is any highlighted tabs.
If highlighted is changed to active:true, then it seems to work just fine - tested with Atom editor.