Palemoon 27 uses noticeably thinner font for Tab and Sidebar text (Different font smoothing technique? Different default font thickness?)
Text was easier on my eyes in 26. Slightly darker, thicker.
BUG:
And it adds 1-2 pixel high line between rows in sidebar. Which adds useless space and makes fewer of them visible.
There might be more "white" space added, not only those lines, seeing how much longer my bookmark sidebar got.


Open pictures in new tabs and compare by switching between them if you can't notice the font difference. (BTW "History" and "Tools" are different too)
http://i.imgur.com/EjmcNYs.png
http://i.imgur.com/oTmkgMF.png
Lines and useless space visible here:


http://i.imgur.com/6OqMIvi.png
http://i.imgur.com/LMv7JE6.png
Windows 8.1
Visible in clean new Palemoon 27 with no addons or option changes too.








