Why do I get an alarming message from what looks like Firefox when I am on facebook and the site will not let me exit out. I have to turn off my computer.
The screen turns complete orange with the firefox logo and warns of something dire about to happen. Since I don't think this is legitimate, I try to exit but the only way I can exit is to turn off my computer.
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If it's like the fake FBI/Interpol browser lock page, This add-on can stop such pages; disallow Script Button {web link} The Disallow Script button looks like a letter "M" and the title is the Minus Script, drag and drop the button on a toolbar. If the button is not displayed then nothing operates, except rules for plugins.
You may have ad / mal-ware. Further information can be found in the Troubleshoot Firefox issues caused by malware article.
Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.