Question

Under 'about:config', why are some options bold while others are not?

I am looking at the options under `about:config`. I notice that some options are bold and some are not. Does bold signify that those particular config options have been changed from the default value? If so, how did they get changed? I have not changed any settings within `about:config`.

See the following screenshot to illustrate my question:

https://www.dropbox.com/s/xskfm42ohpsa0y4/2013.01.25-13.22.42.jpeg

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