I'm having a similar issue on Windows 10. Here's a screenshot of what I see: https://imgur.com/a/NX8CwJv I can reproduce this almost every day on both of my PCs. Both PCs have Avast Free Antivirus installed. When I click the close button, a "Firefox Nighty is not responding" dialog appears. From here I can close the program. After that, I can launch Nightly without a problem. (Maybe Let me know if I can be of any help with dumps, logs etc.
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I'm having a similar issue on Windows 10. Here's a screenshot of what I see: https://imgur.com/a/NX8CwJv I can reproduce this almost every day on both of my PCs. Both PCs have Avast Free Antivirus installed. When I click the close button, a "Firefox Nighty is not responding" dialog appears. From here I can close the program. After that, I can launch Nightly without a problem. Let me know if I can be of any help with dumps, logs etc.