: The sidebar for bookmarks and history can be moved to the right side of the window. Performance Fine-Tuning
in June 2011, Mozilla moved to a "rapid release" cycle, jumping directly to version 6.0. It is likely you are looking for Firefox 55.0 , which was a major update released in August 2017. Key Features of Firefox 55.0
However, for daily web browsing in 2025? No. The web has moved on. You will face broken layouts, HTTPS errors, and extreme security risks.
