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Page is not properly refreshed on scrolling up/down if there is (a) Flash content and a (b) "position:fixed" element present.




14 years ago
13 years ago


(Reporter: bk, Assigned: bugzilla)


Firefox Tracking Flags

(Not tracked)





14 years ago
User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; rv:1.7.3) Gecko/20040913 Firefox/0.10
Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; rv:1.7.3) Gecko/20040913 Firefox/0.10

On scrolling up/down, you see "shadows" of Flash animations (normally gray
rectangles or still frames from the Flash movie) being redisplayed in the same
x-position on the new page (normally in the screen position the flash animation
was at before the scroll). This occurs whether you use the mouse, the scroll bar
or the keyboard to scroll. Tests have shown that if the div containing the ad on
the right (which has "position: fixed") is changed to "position: absolute", the
problem goes away. It does not matter what the content in the fixed div is.

The problem has been seen in both Firefox 0.9.3 and 1.0PR on MacOS X. In both
cases Flash plugin 7.0 was being used. The problem has not been observed in
Linux or Windows. It has not been seen in Camino 0.8 for OS X either.

It sounds similar to bug 256480 (despite a different OS) - perhaps it is related?

Reproducible: Always
Steps to Reproduce:
1. Go to the referenced web page.
2. (If necessary:) Refresh the page until you see some flash content (ads) in
the main part of the page.
3. Scroll down the page.
Actual Results:  
There are gray rectangles and/or still frames from the Flash being displayed on
top of normal content.

Expected Results:  
The page should have been displayed without any "shadow" flash content.

Comment 1

14 years ago
The example page has been changed slightly to
force refresh using javascript. In order to properly see the problem either (a)
switch javascript off temporarily; or (b) change the User-Agent string so that
it no longer matches the regular expression "/Mac OS X .* Gecko\/2004/".

Comment 2

14 years ago
The problem also occurs in Mozilla 1.7.3 on Mac OS X.

Comment 3

14 years ago
Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; ja-JP; rv:1.8b) Gecko/20050204

Comment 4

14 years ago
Also WFM: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8b)
Gecko/20050205 Firefox/1.0+

Please reopen if you can reproduce with a nightly build.
Last Resolved: 14 years ago
Resolution: --- → WORKSFORME

Comment 5

14 years ago
The bug is still present. Some browser-specific javascript in the page just  
makes it slightly harder to reproduce it.  
Re comments #3 and #4: You probably tested by switching to a user-agent string  
corresponding to MSIE 6.0 on Windows. As IE does not support position:fixed,  
the page uses a javascript workaround in this case, defining the ad position  
as absolute rather than fixed (in fact the same workaround as for recent Gecko  
browsers on OS X).  
Please perform further tests with the user-agent string set to a different  
browser, for instance Firefox on Linux or Opera on Windows. 
I tested with the Firefox nightly build for OS X, downloaded 2005-02-10; Gecko 
build date 20050209. 
Resolution: WORKSFORME → ---

Comment 6

14 years ago
Reporter:  Do you have Adblock installed?
If so, this appears to be an Adblock bug...

A good test page is:
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Comment 8

13 years ago
Fixed in Firefox 1.5 Beta 1.
Last Resolved: 14 years ago13 years ago
Resolution: --- → FIXED

Comment 9

13 years ago
Reopening to fix resolution --> wfm
Resolution: FIXED → ---


13 years ago
Last Resolved: 13 years ago13 years ago
Resolution: --- → WORKSFORME
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