Hi denbotelho, old versions of Firefox are always available, but not recommended. There's more info in this article: [[Install an older version of Firefox]]. It would be helpful to know more about your individual pain points with Firefox 89 in order to know whether we can suggest a workaround that will resolve your concerns. ''For example:'' If you prefer the colors of the "Default" theme from Firefox 57-88, someone created an add-on theme that emulates it. You can give it a try here: https://addons.mozilla.org/firefox/addon/photon-colors/ <img src="https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2021-06-02-17-19-21-6cf38c.png"> If that color doesn't suit you, the Firefox Color extension lets you create your own theme: https://addons.mozilla.org/firefox/addon/firefox-color/