We use Mattermost in my company and that would be nice to have it integrated in Opera. I think a lot of co-workers would switch to Opera.
I know there is the custom-sites feature but it's limited to a very few entries and there is no notification counter so if I missed the notif, then there is no way of knowing there is a new message. Also what's the point of limiting the number of sites ? The left bar is huge, and huge of white space too.

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