Is there an auto-linker plugin?

Hi there,
I wondered if there was a plug-in that converts phrases into URLS. So if I wrote ‘Firefox’ it turns that into a linkable URL. Like the acronym replacer.

I found one but it don’t seem to work for me. AT present I am on WP1.22

https://www.huddledmasses.org/2004/06/27/autolinker-by-request-for-wordpress/