diff --git a/README.md b/README.md
index 90d8c76..e17bc41 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,7 @@ Adding `?w=1` to any diff URL will remove any changes only in whitespace, enabli
 [*Read more about GitHub secrets.*](https://github.com/blog/967-github-secrets)
 
 ### Adjust Tab Space
-Adding `?ts=4` to a diff or file URL will display tab characters as 4 spaces wide instead of the default 8. The number after `ts` can be adjusted to suit your preference. This does not work on Gists, or raw file views, but a [Chrome extension](https://chrome.google.com/webstore/detail/github-tab-size/ofjbgncegkdemndciafljngjbdpfmbkn) can automate this.
+Adding `?ts=4` to a diff or file URL will display tab characters as 4 spaces wide instead of the default 8. The number after `ts` can be adjusted to suit your preference. This does not work on Gists, or raw file views, but a [Chrome](https://chrome.google.com/webstore/detail/github-tab-size/ofjbgncegkdemndciafljngjbdpfmbkn) or [Opera  extension](https://addons.opera.com/en/extensions/details/github-tab-size/) can automate this.
 
 Here is a Go source file before adding `?ts=4`: