This is really quite perfect for me. I have been using almost exclusively lately. It just works better for my internet and in-game performance. My only two gripes are these:
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I would like to be able to ctrl-click tabs from one instance of my browser, and collectively move them to the other instance. As in, if I have two open windows of Opera, I can drag any number of tabs from one to the other all at once through multiselecting.
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When closing out of tabs, they currently grow instantly to fill up the new empty space, but it would be nice if they stayed where they are until I am done exiting out of tabs. If you want an example of what I mean, in Google Chrome you can open like 20 tabs, and if you just spam click the "x" button in one place on one of the tabs, the rest will stay the same size and just move to the position of your mouse so that you can just hit x on them over and over again, and then AFTER you are done they fill in the space on the top bar.
Those are the only two things that I would adore. That and being able to customize the top bar graphic, but that's more of a luxurious request than functional.