fix errors

README.md

@@ -68,9 +68,11 @@
 * [unmung.com/mastoview](http://www.unmung.com/mastoview) - Preview the local or federated timeline of any instance.
 * [Toot scheduler](https://scheduler.mastodon.tools/) - Schedule now, toot later.
 * [Last](https://framagit.org/luc/last) - Aggregate toots on a web page providing Atom feed and an epub (Perl).
-* [Mastodon Tags Explorer](https://mastodon-tags-explorer.hcxp.co/tags) - Explore what's currently trending in Mastodon network.
-* [Mastodon Toot Bookmarklet](https://rmlewisuk.github.io/mastodon-toot-bookmarklet/) - Bookmarklet to toot the current page ([source code](https://github.com/rmlewisuk/mastodon-toot-bookmarklet/))
 * [Forget](https://forget.codl.fr/about/) - Delete toots after a user defined period of time (Python [source code](https://github.com/codl/forget/)).
+* [Mastodon Toot Bookmarklet](https://rknightuk.github.io/mastodon-toot-bookmarklet/) - Bookmarklet to toot the current page ([source code](https://github.com/rknightuk/mastodon-toot-bookmarklet/))
+* [Mastodon – Simplified Federation!](https://addons.mozilla.org/firefox/addon/mastodon-simplified-federation/) - Redirect clicks on remote follow/interaction buttons to your own instance ([source code](https://github.com/rugk/mastodon-simplified-federation)).
+* [Fediverse Explorer](https://fediverse.0qz.fun/) - Trending hashtags and popular toots, regenerated every hour.
+
 
 ## User styles