Provide a drop down list of open tabs (with selection)
It can get a bit awkward to find a file that's already open, if there are a lot of them (more tabs than can fit on the screen horizontally). Scrolling horizontally to find one becomes a bit unwieldy once there are more than a certain number open - especially if you're in the habit of using long, descriptive file names, like I am.
What I'd like is a drop down list of open tabs, in addition to the scrolling mechanism that's there now - e.g. accessed by a small button on the right hand end of the tab bar, after the two arrow buttons, similar to the one in Firefox, Opera, or the old version of Foxit Reader I use (3.1 - I gave up on more recent versions, so I don't know if they still do that).
No matter how long the file names are, a vertical list can easily show two or three dozen open tabs - which should be enough for almost anyone.
It should also let us switch instantly between tabs, by selecting one from the vertical list, instead of having to scroll through horizontally, to find the right one. If necessary, the tab bar should then be scrolled to also show the selected tab.