We have tooltips for the close buttons on our tabs, but not for the ones on the bars.
These also don't have accessibility descriptions; I thought we had a bug on that, too, but I can't find it.
For the accessibility description, we'd need a nib change like bug 438494 (although we could probably do it in code temporarily during/past an l10n freeze). For the tooltips: For safe browsing, we could call setTooltip: in SafeBrowsingBar.mm's awakeFromNib: (like Stuart did in bug 410384), though that would need a localizable string. For the pop-up blocker bar, there's no code file, so I guess we'd have to set the tooltip in the nib, too.
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