Install an extension

Sval runs the extensions on addons.mozilla.org, Mozilla’s extension site. Ad blockers such as uBlock Origin can inspect and block each request before it’s sent.

You want uBlock Origin’s own filter lists on top of Sval’s blocking.

Install from addons.mozilla.org

1. Go to addons.mozilla.org and open the extension’s page.
2. Select the page’s button for adding the extension.
3. In the prompt that lists what the extension can do, select Add.

The extensions menu opens and says the extension was added. Select OK, or Pin to toolbar to put its button on the toolbar.

Install from a file

1. Open Settings › Extensions.
2. Under Installed, select Install from file….
3. Choose the extension’s file, then confirm.
4. In the prompt that lists what the extension can do, select Add.

Details

• Sval runs Manifest V2 and Manifest V3 extensions. Both can inspect and block each request before it’s sent.
• Sval doesn’t install themes, or extensions that use containers. To keep sign-ins apart, use an isolated Workspace. See Isolate a Workspace.
• An extension that hides tabs only sees the tabs in the Workspace on screen. When you install one, the extensions menu warns you and offers Remove or Keep.
• Extensions you install stay on this device. Install them on each of your devices.

If something goes wrong

• Sval doesn’t support themes. Sval draws its own colors, so it stopped the install.
• Sval doesn’t support the extension. The extension uses containers, so Sval stopped the install and suggests an isolated Workspace instead. An extension like this that was already installed is turned off, with the same advice and a Remove button.

Related pages

• Pin an extension to the toolbar
• Remove an extension
• Extension settings and controls