User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0 Build ID: 20151014143721 Steps to reproduce: Use last release of Firefox (41.0.2) with 5 or 6 tabs opened including URL http://www.marca.com. When I use a tab with this URL, Firefox blocks because Firefox.exe use 2,8 to 3,0 Gigabytes of memory. Actual results: Firefox blocks with opened URL http://www.marca.com in a tab in 20-30 minutes.

Is it reproducible with a fresh profile? (it could be an issue about your add-ons) https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles If yes, when the memory use is really high, enter about:memory in the location bar and save a memory log, then attach it to the bug report.

we need the log from about:memory when the memory use is high, it's more useful than this screenshot.

Attached screenshot of memory used by firefox.exe in this moment.

Ok,I´ll try, but normally my laptop blocks when firefox use 2,8 Gb to 3 Gb of memory.

You can save the log when it's 2.5 GB. There is the add-on MemChaser (https://addons.mozilla.org/en-us/firefox/addon/memchaser/) to dislay the memory use, so when you see it's too high, you can save the memory log before the computer blocks.

Ok. Firefox crashed but gave me a log with the problem. 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TotalPhysicalMemory: 4240293888 TotalVirtualMemory: 4294836224 URL: about:memory Vendor: Mozilla Version: 41.0.2 Winsock_LSP: MSAFD Tcpip [TCP/IP] : 2 : 1 : MSAFD Tcpip [UDP/IP] : 2 : 2 : %SystemRoot%\system32\mswsock.dll MSAFD Tcpip [RAW/IP] : 2 : 3 : MSAFD Tcpip [TCP/IPv6] : 2 : 1 : %SystemRoot%\system32\mswsock.dll MSAFD Tcpip [UDP/IPv6] : 2 : 2 : MSAFD Tcpip [RAW/IPv6] : 2 : 3 : %SystemRoot%\system32\mswsock.dll Proveedor de servicios RSVP TCPv6 : 2 : 1 : Proveedor de servicios RSVP TCP : 2 : 1 : %SystemRoot%\system32\mswsock.dll Proveedor de servicios RSVP UDPv6 : 2 : 2 : Proveedor de servicios RSVP UDP : 2 : 2 : %SystemRoot%\system32\mswsock.dll MSAFD RfComm [Bluetooth] : 2 : 1 : useragent_locale: es-ES Este informe también contiene información sobre el estado de la aplicación cuando se cerró.

This bug happens when URL http://www.marca.com autorefresh every certain time. Then, is when firefox.exe begins to consume excessive memory how you can see in file the screenshot anexed called "memory 0004.jpg".

Hi, that was information you provided about the crash. We need a Firefox memory log with information before that. Please install the aforementioned Memchaser https://addons.mozilla.org/en-us/firefox/addon/memchaser/ and click on the button to enable logging. Then upload the log file here after the issue occurred again-

OK. I'll install the add-on and make bug happens. Greetings from Spain.

Ok. Here are two logs of menchaser add-on

This seems JavaScript related, see comment 10. Moving to that component.

I kept this site open in a tab for several hours. Memory usage slowly climbed from ~550mb to ~750mb. It didn't seem like I was going to hit 2gb so I closed that Firefox.

This is the answer of support of www.marca.com : "Estimado usuario, Le informamos que hemos estado probando y efectivamente sucede lo que dice nos indica. Vemos que la gestión de memoria en esta versión de Firefox no es la más óptima para páginas tan grandes como marca.com. Vamos a realizar más tests y estamos preparando un site con una mejora de rendimiento." My brother told me this morning that he has the same problem with firefox and autorefresh in www.marca.com

Jesus Manuel, thank you for your help tracking this down. Two reports from 'about:memory' [1] would be useful here. One when you first load the page, and one 15 minutes later (just before you run out of memory). Can you also describe your setup? From the screenshots it looked like you might be running Windows in a VM or over VNC on an apple host, it's possible this is a contributing factor. [1] https://developer.mozilla.org/en-US/docs/Mozilla/Performance/about%3Amemory#How_to_generate_memory_reports

Thanks. In Firefox release 42.0 the problem is fixed. I have no problems anymore with this URL. Greetings from Sapin.