Firefox provides settings and configuration windows in a user friendly way. But as a browser it provides a lot of configuration and all of these configurations can not be put in to forms. We can access this detialed configuration through browser address bar.
Firefox以用户友好的方式提供设置和配置窗口。 但是作为浏览器，它提供了很多配置，并且所有这些配置都无法放入表单中。 我们可以通过浏览器地址栏访问此详细配置。
打开所有配置 (Open All Configs)
We can open about config by putting about:config into address bar. This will show us a warning about the sensitivity of the configuration page we want to open.
我们可以通过在地址栏中输入about:config来打开about config。 这将向我们显示有关要打开的配置页面的敏感性的警告。
After clicking the button I accept the risk we will see following screen which will list all configuration.
单击按钮后， I accept the risk我们将看到以下屏幕，其中列出了所有配置。
搜索和过滤关于配置(Search and Filter About Config)
As we see there are a lot of configuration parameters. Finding a configuration from this list by searching with eye is very hard. We can use Search box in the start of the page. In this example we will search for mp4 configuration or term.
我们看到有很多配置参数。 通过眼睛搜索从该列表中查找配置非常困难。 我们可以在页面开头使用Search框。 在此示例中，我们将搜索mp4配置或术语。
添加新偏好(Add New Preference)
We can add new configuration line simply clicking one of the configuration with right mouse button and selecting one of the type from New menu
我们可以添加新的配置行，只需用鼠标右键单击配置之一，然后从“ New菜单中选择一种类型即可。
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Stringis used for text valuesString用于文本值 -
Integeris used for numeric valuesInteger用于数值 -
Booleanis used logicTrueandFalsevaluesBoolean值用于逻辑True和False值
As an example we have selected String . First we put the value name which is Test in this case.
作为示例，我们选择了String 。 首先，在这种情况下，我们输入值名称Test 。
Than we put the value of the Test configuration which is This is test
比我们把“ Test配置”的值输入“ This is test
Preference Status
偏好状态
Most of the preferences comes by default but we can change them. As we see in previous example we can also add new preference. Preference Status ‘s are
默认情况下，大多数首选项都是默认的，但是我们可以更改它们。 正如我们在前面的示例中看到的，我们还可以添加新的首选项。 偏好Status为
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user setis defined or changed by useruser set由用户定义或更改 -
defaultis provided by browser.default由浏览器提供。
翻译自: https://www.poftut.com/how-to-list-filter-add-remove-change-firefox-settings-from-aboutconfig/