User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0 Build ID: 20151216175450 Steps to reproduce: Start a video in Facebook. Click the video and it expands into a larger window with similar videos listed below it Watch the video. When it finishes the next will autostart (or you can click them each) The videos continue to play in this same window. Actual results: The memory grows with each video. You can watch this in in Task Manager Eventually Firefox will start having problems.. Unable to play videos, clickable items not responding. For me this is when Firefox memory usage tops 2gb. I have to restart Firefox to continue. And of course because of the way facebook works it's very hard to find your place again to continue watching after restarting. Expected results: I guess I expect the memory to not grow with each video watched but to maintain a relative constant due to new windows not being created (unless it is technically new windows in which case I would expect the memory to be released from the previous). Or perhaps a watchdog that reclaims memory at a certain threshold. Anyway, it's reproducible for me every time. I do have AdBlock Plus, TinEye, and Wot installed but the results are the same in safe mode also. System: Windows 7, I7, 16gb memory. Firefox v43.0.1 This problem existed prior to this version as well. I tried updating in hopes of a fix.
Did you test with a fresh profile? https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles
I did not test with a fresh profile. But I just reproduced the issue on another computer at an unrelated location with a fresh install of windows 7.
Can you paste in the graphics section of about:support?
Also paste in about:memory after clicking on Minimise memory usage.
Is this issue still reproducible? Can you answer the questions in comments 3 and 4 above?
Not much we can do without hardware details. Feel free to answer questions and re-open the bug.