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# Modify browser preferences

You can edit application settings (preferences) that are read from the profile files, prefs.js and user.js, and from application defaults.

Note: Supported on TruClient Browser only.

To modify application settings on TruClient Browser:

1. Open a script in Develop Script mode.

2. Enter `about:config` in the browser address bar.

3. Acknowledge the warning.

4. Search for the preference name you want to edit and modify the value.

5. Save the script.

6. Verify that the user_modified_perfs.json file was created or modified in the script folder.

Note: Do not modify TC* or TruClient related settings as these changes are ignored.

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