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Monitor became unplugged plugge in again and now screen lime green
How do I get screen back to white
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Is this a Firefox issue?
You are running a very out of date version of Mac OS (10.7). Can your system support an update to Mac El Capitan? https://support.apple.com/en-us/HT206886
If you can, I suggest updating to El Capitan, and then update Firefox to 63.0.3 or later.
Did you try to disconnect and reconnect the monitor cable at both sides?