How to false value to true for webGl.force

Just joined Tinkercad and Webgl is enabled but not running. I went to :config for Firefox, found the WebGL.force enable but the value is false. How do I change the value to true? The line highlights blue and there is a right click drop down menu. Copy/ Copy Name/ Value... do I click on one of those? I can't find any info. all any instructions I find just tell you to change it. How do I change?. I just don't want to do something wrong and screw things up. Thanks for help



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