GUI issue: wrong button placement
I just upgraded to the latest Zotero version: Zotero 3.0.1 Firefox plugin on Windows 7 Pro (32-bit). A minor issue: the "Info, Notes, Tags, Related" row of buttons at the top of the right column now comes to overlay the top of the box below it, partially hiding, for example, the "Item type" line. On a small screen this makes it a bit fiddly to change the type of an item.
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http://likedeeler.files.wordpress.com/2012/02/zotero-screenshot.png
Since the theme has not been changed/updated for a while, the collision of buttons and content below them seems to be caused by changes in Zotero. The OSX theme translates tab pages to a button row whose lower half is rendered onto the top of the page. An example:
http://likedeeler.files.wordpress.com/2012/02/options-screenshot.png
Maybe they can do that because FF GUI guidelines specify a certain amount of padding at the top of tab pages (my guess, not sure), such that the overlay is guaranteed not to interfere with page content.
Well, no big deal after all. Thanks for your feedback!
(Also, FWIW, the OS X "pinstripe" theme that ships with Mozilla still uses real tabs in a tabbox by default unless it's in the preferences, although we have custom styling for our tabbox that applies only on OS X.)