I always use middle-click on the New Tab button to open a tab to the right (with browser.tabs.searchclipboardfor.middleclick disabled). Also, duplicating a tab can be done with dragging and Ctrl-dropping. So, right off the bat, the top two entries ar...
After trying this for a few days, I found the borders around the window to be extremely problematic since it violates the “rule of the infinite edges” (see Fitts’s Law), i.e. UI elements at the edge of the screen are suddenly much harder to reach and...