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-rw-r--r--browser/themes/shared/tabs.inc.css5
1 files changed, 3 insertions, 2 deletions
diff --git a/browser/themes/shared/tabs.inc.css b/browser/themes/shared/tabs.inc.css
index 632a6e606..c505416e4 100644
--- a/browser/themes/shared/tabs.inc.css
+++ b/browser/themes/shared/tabs.inc.css
@@ -55,8 +55,9 @@
.tab-background-middle {
-moz-box-flex: 1;
background-clip: padding-box;
- border-left: @tabCurveHalfWidth@ solid transparent;
- border-right: @tabCurveHalfWidth@ solid transparent;
+ /* Deliberately create a 1px overlap left/right to cover rounding gaps */
+ border-left: calc(@tabCurveHalfWidth@ - 1px) solid transparent;
+ border-right: calc(@tabCurveHalfWidth@ - 1px) solid transparent;
margin: 0 -@tabCurveHalfWidth@;
}