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I'm running Firefox 51.0 (64-bit) on Debian GNU/Linux 8.7 (jessie).
The right click menu does not display when I right-click the page. This was happening before, stopped after I did an apt-get upgrade, and has no started again.
Instead of the normal right-click behavior, it alternates between two cursors, generally the text cursor and the pointer cursor.
This is reproducible on any site, including example.com
It happens even in safe mode, with a completely new profile.
There is nothing wrong with the hardware. Right-click works fine in other programs.
Mozilla bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1344620
Debian bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=856911
I tried apt-get purge (completely removing Debian-packaged Firefox), then a completely fresh profile (with upstream Firefox installed from tar.bz2), but that does not solve it. – Matthew Flaschen – 2017-03-06T06:13:19.467
I'm sorry to hear that. Unfortunately, I can't help you any further. :( Good luck solving it! – Theo C – 2017-03-06T20:05:08.843