I have the Substrate Connect light client browser extension installed but there are no networks listed in the options.

Click into the Options in the extension:

Browser extension

Clicking Networks does nothing:

Browser extension settings page

How do I connect to a substrate-based network using this extension?

The docs don't give many hints. I have bolded part of the below.

For in-browser use, Substrate Connect provides a Browser Extension built upon the @substrate/light node module that is running the selected light clients inside the extension so that the end-user doesn't need to fire up a light node in every browser tab. This will also allow the light-node to keep syncing as long as the browser window stays open.

1 Answer 1


Apps that are built with substrate connect compatibility will detect whether the user has the extension and use it, or create the WASM light client in-page for them.


For instance, Polkadot, Kusama and Westend can be accessed through Substrate Connect. After opening https://polkadot.js.org/apps/#/explorer you have an option to switch to light client

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If the connection is successful, you should see it under the networks tab

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  • Does this mean the chain is only syncing in the extension if an app is connected?
    – forgetso
    Commented Mar 29, 2022 at 10:15
  • 1
    @forgetso not really. While extension is running the well known networks (Polkadot, kusama, rococo and westend) are syncing in the background and the latest state is saved in the localstorage. This way when an app is connected will start syncing from that latest state, which makes the sync period smaller.
    – Nikos
    Commented Nov 25, 2022 at 22:58

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