If you are a Firefox user you most certainly have come in contact with the browser's about:config dialog that displays advanced configuration settings and preferences. Most of the preferences listed here are not displayed in the browser's options menu that you can open from within the interface.
Add-ons make the preferences listing more accessible. You can for instance install Gui:Config to make available the majority of preferences in a configuration window.
Probably the biggest issue that you will run into is that the browser itself does not display information about the preferences on the about:config page. If you do not have an extension like What's That Preference installed, you either need to know the preference and the values it accepts, or search for information on a search engine like Bing, Google or DuckDuckGo.
Config Descriptions is a new add-on for the browser that adds comments to many about:config preferences. When you open the about:config page after installation of the extension, you will notice the Source Comment column that it has added to the table here.
The comments may offer a description of a preference, or display the various values that you can change a preference to. As you can see from the screenshot above, not every preference has a comment attached to it. The majority of preferences though have and most of the descriptions help you understand what a preference is all about.
Extension preferences on the other hand do not offer comments, as do some of the regular browser preferences listed here. You'd still need to use a search engine to find out more about those then, but the frequency of those look ups should be reduced greatly after installing the add-on.
If you are a Firefox user who likes to tinker with those advanced preferences, then this extension is a must have.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.