While Firefox does not have a "download" button for its entire configuration list, you can manually export your settings by accessing the file in your profile folder or by copying entries directly from the about:config page. How to "Download" or Export Your Firefox Config
In the folder that opens, find the file named . This is a text-based file containing all your custom configuration settings.
If you want to create a configuration file that automatically applies settings to new installations, you can create a mozilla.cfg file (often initially saved as a .txt file). : Create a new text file named mozilla.txt . Download config mozila txt
: Add your desired settings using lockPref("preference.name", value); .
: Click Show All or use the "Show only modified settings" filter to see the preferences you have actually changed from their defaults. Locate the Local Config File : Enter about:profiles in your address bar. While Firefox does not have a "download" button
Find your active profile (labeled "This is the profile in use") and click next to the Root Directory .
: Type about:config into your address bar and click Accept the Risk and Continue . If you want to create a configuration file
: The first line must start with two forward slashes ( // ).