I installed Ubuntu 18.04.2 LTS on my MacBookPro three weeks ago. Since then, generally at least once a day, Firefox will cause the whole desktop to freeze, even the shortcuts (to open the terminal for example) do not work anymore and all I can do is force shut down the computer by pressing the power button a few seconds. I already asked a question here : https://askubuntu.com/questions/1129681/youtube-random-crash-audio-keeps-repeating-a-given-sound-unable-to-do-anything Unfortunately, what they recommended - disabling hardware acceleration and installing a new graphic card - did not solve the issue. Since I asked this question there, I also found out that Firefox not only freezes on YouTube, but potentially everywhere. I also tried to create a new profile, deleting all add-ons and even totally removing Firefox and do a fresh installation, but that did also not solve the issue. Strangely, this does only happen in Firefox in Ubuntu, not in OS X or in Windows 8 (installed via BootCamp) where I also use it. Here is a video showing the problem if it can help: https://www.youtube.com/watch?v=YZrK1bsnHCo So yeah, I don't really see what else it could be and would appreciate your help. Thanks for your support !