I really love the new picture-in-picture option. It's especially helpful when I only have one monitor. There are a couple of rough-edges I'd like to see tweaked. 1. I resize these windows all the time to put them where they'll fit when I'm doing something else, and it can finicky to resize the window quickly. It would be helpful if the areas you can grab the edges and corners of were exaggerated. For example, if when the user's mouse is near an edge or corner of the picture-in-picture window a handle pops-up around the given area that's larger than the 1pixal-ish default handle area. I've seen similar functionality in the art program GIMP for selection boxes. 2. The way the window acts when being resized isn't very intuitive. The corners work as expected, but since the corner areas are so small I often grab the sides and that can get frustrating. I now know that when grabbing the Bight and Bottom sides of the window the Top-Left corner is anchored while resizing. Similarly, when grabbing the Left and Top sides of the window the Bottom-Right corner is anchored. That seems pretty intuitive when I type it out, what's the issue? Well, the problem comes when you are grabbing the window near the corners. If for example, I'm trying to grab the window by the Bottom-Left corner and miss (which I've done plenty) and grab the Bottom of the window. Now when I resize the window is anchored in the Top-Left instead of the Top-Right, which is the opposite of what I wanted and leads to some confusion and repositioning. What I would suggest, separate from the #1 solution, would be to break the sides of the window into three areas: Near-corner 1, Center, and Near-corner 2. When grabbing the window on the edge in one of the Near-corner areas, anchor the window at the opposite corner. When grabbing by the center of an edge anchor the window by the opposite center. Thank you for reading my long suggestion. I hope you don't find this to be a negative interaction. I truly enjoy Firefox, and I've very excited about your new Picture-in-picture feature. I hope you understand that this level of nit-picking can only come from a place of love! P.S: I'm very pleased to say that I did not include a third issue I had with the Spacebar Play/Pause functionality not working unless the Play button was the last object clicked on the window, because in the latest update it was gone! I want to thank whomever worked on that and let them know, someone did notice, and they appreciate it! <3 <3