It would indeed be a cool feature, and it will draw attention to Vivaldi. But to be fair, there are already some great ad and tracking blockers out there. But a standard feature would be nice. I would say, look at Ghostery for some inspiration.

@eggcorn said in I accidentally ... Vivaldi tab on Firefox....:

Mind you, it has been a few years since the original post.

I believe the correct term per the Oxford Dictionary of the English Language, 1973 edition, is "necrobump"

Thanks for implementing this feature.

I have a follow-up feature request to improve the open tabs list to show tabs stacks in the list.. Show Tab Stacks in Tab Scroll arrows open tabs list

Here is a video for those unfamiliar. You should just use multiple windows. You can select tabs on the tab bar and move them to other windows.

@izacks It may claim to be rejecting 3rd party cookies but under the current schema it's not, unless you are accessing EVERYTHING currently on vivaldi.net and none on vivaldi.com (which I think may now be possible.) It is not, or should not be, possible to log in on two linked domains unless cookies from both are accepted. It is a security vulnerability to do so. It is just possible, I suppose, that firefox is treating them as un-connected domains, which it should not - as they cross-reference each other.

@waterfire I am also a long time Firefox user who has switched to Vivaldi.
There is nothing better than Session Manager by Morac for Firefox. It automatically makes session backups, and restores them superbly.

As far as I know, Vivaldi only has a manual session backup, so that is useless for me.
Session Buddy is what I use. It is nowhere near as good as Session Manager by Morac for Firefox, but at least it makes automatic session backups.