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-rw-r--r--lib/dom_utils.coffee3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/dom_utils.coffee b/lib/dom_utils.coffee
index 24747837..c8ddcedf 100644
--- a/lib/dom_utils.coffee
+++ b/lib/dom_utils.coffee
@@ -293,7 +293,8 @@ DomUtils =
style = getComputedStyle box
if style.position == "static" and not /content|paint|strict/.test(style.contain or "")
zoom = +style.zoom || 1
- ratio = window.devicePixelRatio ? 1
+ ratio = window.devicePixelRatio
+ ratio = 1 if Utils.isFirefox() or not ratio?
top: Math.ceil(window.scrollY * ratio / zoom), left: Math.ceil(window.scrollX * ratio / zoom)
else
rect = box.getBoundingClientRect()