Some setting in about:config maybe? It's kinda ridiculous that it disappears with like 12 tabs open.
(I know I can click scroll-wheel on my mouse to close it, but it's still a problem when I'm using trackpad)
If you set browser.tabs.tabClipWidth to 0, it will show the close button until it needs to start scrolling tabs.
This is exactly what I wanted, thanks a lot!
tree-style tabs / sideberry - never look back.
sideberry while keeping the tab bar on top cuz you're too lazy to edit your userchrome 
I have three finger tap bound to middle click on trackpad. Could you do something similar?
no :/
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