+++ This bug was initially created as a clone of Bug #861933 +++ I'd say the indented menuitems are less desirable than the partially completed separators, so let's go with this patch for now. But please file a follow-up bug to do something about those separators, if you haven't already.
The indentation happens only on default theme, so put the rule in @media (-moz-windows-default-theme). The original separator color is #E0E0E0. With ThreeDLightShadow we are using #E3E3E3. This should be close enough and not visible as they aren't mixed in this popup.
Created attachment 754209 [details] [diff] [review] patch Oops, somehow the patch wasn't attached.
On Windows XP (without the patch) the separators are full width but the "Tags" and "Custom views" items are indented. Is that how it should be?
Comment on attachment 754209 [details] [diff] [review] patch Looks good! Thanks!