When I made the report it happened more often, and I seem to remember (but I'm
not sure) that it did it even without extensions.
Now it happens much less.
It happens randomly, but sometimes it blocks the PC.
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Thanks for the additional information Stefano.
It appears you're using a number of extensions. Does the problem occur if you
disable all extensions?
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This is a picture of the screen. I had to restart Firefox.
** Attachment added: "Firefox Freeze"
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1792329/+attachment/5211069/+files/Firefox%20Freeze.png
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