I have a laptop connected to an external monitor and when Nightly is in the laptop screen, sometimes right clicking makes the menu appear but it starts animating. Included a video of this happening in the URL field.
This happens to me as well, but has also happened when Nightly is on the ext. monitor. I don't remember it happening when I didn't have the 2nd monitor connected, but that doesn't mean it hasn't happened.
It seems to mostly happen when right-clicking on links.
Possibly related to (or a dup of) bug 788189.
Needless to say, we need reliable STR and a regression range.
What version(s) of OS X are people seeing this on?
I'm on OSX 10.7.4 Nightly 18.0a1 (2012-08-31)
I'm on: OX 10.7.4 and Nightly 18.0a1 (2012-09-05)
Upgraded to 18.0a1 (2012-09-05) and still happening. It does indeed seem to only happen when using more than 1 monitor.
If you disable hardware acceleration in the advanced options (restart FF to apply), does it fix the issue?
Disabling hardware acceleration for me did not work - actually made the animations move even faster :)
It was already disabled for me. Enabling it does not seem to have made a difference.