Commit from Mozilla Verbatim by user michael.koehler1@gmx.de.: 5455 of 5455 strings translated (0 fuzzy).
Bug 931370: Overlap between Tabzilla & Other Applications drop-down menu

Also included:
Revert "set tabzilla to default z-index (bug 927168)"

This reverts commit 060721132420e8909c19f607d65deae7f891dabb.