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# How to view the modified flags in about:config of Firefox
- URL: https://en.blog.themarfa.name/how-to-view-the-modified-flags-in-about-config-of-firefox/
- Published: 2020-04-13T05:47:15.000Z
- Updated: 2020-04-13T05:47:15.000Z
- Description: Advanced users prefer to configure browsers mannualy. Firefox and Chrome, offers a set of hidden parameters for tweaking the browser about:config. But how do you know which flags you have changed, and what is the default?
- Author: Konstantin Dokuchaev
- Tags: Firefox

Advanced users prefer to configure browsers mannualy. Firefox and Chrome, offers a set of hidden parameters for tweaking the browser about:config. But how do you know which flags you have changed, and what is the default?

*This is autotranslated version of [this post](https://blog.themarfa.name/kak-posmotriet-izmienionnyie-flaghi-about-config-firefox/).*

It is very easy. Open the page `about:config` and accept the risks. Click Show all.

![](https://blog.themarfa.name/content/images/2020/04/image-88.png)

Open the developer console using hot keys `Ctrl+Shift+K` (on macOS `Command+Option+K`). In the console write the `enable box` and press Enter.

![](https://blog.themarfa.name/content/images/2020/04/image-89.png)

This will enable you to use CTRL+V. Paste the following code:

`var elments = document.getElementsByTagName('tr');`  
`[...elements].filter(`  
`el => !el.classList.contains('has-user-value')`  
`).forEach(`  
`el => el.style.display = (el.style.display === 'none') ? 'table-row' : 'none'`  
`);`

Now displays only those settings that you have changed.

![](https://blog.themarfa.name/content/images/2020/04/image-90.png)