For a Single Browser:

1. Locate the browser where you want to mute sound, then click the "" icon to access the settings page.

2. Navigate to "Preference", and enable the "Mute Audio" option. After configuring, click "Confirm" to save.

Once this feature is enabled, all video or audio content will play normally but in mute mode. You can follow the same steps for new browsers.

For Multiple Browsers:

1. Check the browsers you need to set.

2. Click on the "More" button in the top right corner -> Batch Edit Browser -> Edit All Browser of Selected.

3. Scroll down to "Preference" and enable the "Mute Audio" feature. Then click "Confirm" to save.

For All Browsers:

1. Go to the [Settings] menu on the left sidebar, and then click "Add Browser Template (Preference)" at the top.

2. Enable the "Mute Audio" option. This will ensure all videos or audios in browsers will auto-play in mute mode by default.

3. Click "Save" at the bottom to apply the settings.