User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0 (Beta/Release) Build ID: 20131205075310 Steps to reproduce: Open our WebSite in a tab. Open a second tab and if i go back to the first tab text will appear under a scrollable div. Actual results: See attached file (screenshots). Afte go back to the first tab text will appear under my scrollable divs. The text is outside the divs and if i scroll the div text is still there under the div. Expected results: The text below the div should not be displayed. Only after scrolling the text should be displayed only within the div.

Comment on attachment 8348636 [details] Screenshot Bugreport.png I can reproduce this on different PCs with different Windows-OS. On my own PC i have reinstalled firefox but the shown effect is still there.

In other browsers (IE, Chrome, ...) after the tab was changed the text under the div is not displayed. So i think my html-code is ok.

Thomas, is there a link to the site in question? It's hard to say what's going on based on a screenshot...

Hi Boris, sorry but the site is our business-webapplication and only for people with registration. It is a application with healthcare-data so that i can´t get you an account.

Thomas, can you extract the HTML and CSS of that page into a standalone testcase that reproduces the problem? Did the page work correctly in earlier versions of Firefox?

Hello Mats, in earlier versions of firefox the page work correctly. Today i recognize that text was shown right of the div too. Over the scrollbar. I will try to create a standalone version to show you the problem.

The bug is also visible in Add-ons-Manager. Steps to reproduce: 1) Open the Add-ons-Manager (make sure there are enough Add-ons that the list becomes scrollable and that there is a partially visible line of text) 2) Switch to another tab (maybe wait a few seconds?) 3) Switch back to the Add-ons-Manager tab BTW, this bug is also visible at other places, but this is probably the easiest place to reliably reproduce the bug. Grafik DirectWrite aktiviert false (7.0.6002.23200) Geräte-ID 0x2a02 GPU #2 aktiv false GPU-beschleunigte Fenster 5/5 Direct3D 9 Karten-Beschreibung Mobile Intel(R) 965 Express Chipset Family Karten-RAM Unknown Karten-Treiber igdumdx32 igd10umd32 Treiber-Datum 2-26-2009 Treiber-Version 7.15.10.1666 Vendor-ID 0x8086 WebGL-Renderer Google Inc. -- ANGLE (Mobile Intel(R) 965 Express Chipset Family Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote false AzureCanvasBackend skia AzureContentBackend none AzureFallbackCanvasBackend cairo AzureSkiaAccelerated 0

Does the problem also occur in a Nightly build? http://nightly.mozilla.org/

(In reply to Mats Palmgren (:mats) from comment #8) > Does the problem also occur in a Nightly build? > http://nightly.mozilla.org/ No, I can't reproduce it with the nightly built from http://hg.mozilla.org/mozilla-central/rev/37516445a0b5 Graphics Adapter Description Mobile Intel(R) 965 Express Chipset Family Adapter Drivers igdumdx32 igd10umd32 Adapter RAM Unknown Device ID 0x2a02 DirectWrite Enabled false (7.0.6002.23200) Driver Date 2-26-2009 Driver Version 7.15.10.1666 GPU #2 Active false GPU Accelerated ´ Windows 1/1 Direct3D 9 Vendor ID 0x8086 WebGL Renderer Google Inc. -- ANGLE (Mobile Intel(R) 965 Express Chipset Family Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote false AzureCanvasBackend skia AzureContentBackend cairo AzureFallbackCanvasBackend cairo AzureSkiaAccelerated 0 The only reported difference seems to be the value of AzureContentBackend.

Thanks for your help. Can you reproduce it in beta and aurora? http://www.mozilla.org/en-US/firefox/channel/

I tried with beta and aurora as well and the results are: bug visible in: Add-ons-Manager Page Info* --------------- ---------- 26.0 Yes Yes Beta (27.0b5) No Yes Aurora (28.0a2) No Yes Nightly (29.0a1) No No *Steps to reproduce: 1) Open a web page with enough images to create a scrollable list in page info. 2) Right click an image and choose view image info 3) If the glitch is not immediately visible switch to e.g. permissions tab and then back to media tab of page info.

Bug 953334 fixed a clipping bug (that started in FF26) and the fix landed in beta/aurora on 2014-01-13. Maybe it fixed this bug too? Can you test again please?

I tested it again: bug visible in: Add-ons-Manager Page Info --------------- ---------- Beta (27.0b5) No Yes Beta (27.0b6) No No So it was apparently fixed by bug 953334.

Great, thanks for testing!