Glad I'm not misremembering! I found some posts from from 2004 which does refer to the icon: https://fantasai.inkedblade.net/weblog/2004/firefox-altss/ https:

Glad I'm not misremembering! I found some posts from from 2004 which does refer to the icon: https://fantasai.inkedblade.net/weblog/2004/firefox-altss/ https://fantasai.inkedblade.net/weblog/2004/firefox-altss/ https://web.archive.org/web/20041103090311/http://weblogs.mozillazine.org/roadmap/archives/006411.html https://web.archive.org/web/20041103090311/http://weblogs.mo... I wish I could find some screenshots!