Why, if I don't scroll or respond to Facebook, does Firefox display a flash "x-marks" shield and wipe out the menu bar?
I have a MacBook Pro, OS 10.5.8. Firefox (16.0.2) wipes out the menu bar and effects a screen freeze in Facebook and some sports sites if I do not actively refresh the screen. If I catch it in time it can be brought back to life by executing a screen close command (command w), otherwise it is a freeze and I have to quit the program. Sometimes I need to force quit and sometimes even shut down the computer and restart it in order to get back up and running. What gives?
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It may be that Firefox 16 does not optimize the interactive page content that Facebook interface uses. I would recommend updating Firefox to the latest version to see if the performance improves. Update Firefox to the latest release