Macworld.com – Hot on the heels of the release of Safari 4 comes the final version of Mozillaâs Firefox 3.5. Originally slated to be a â.1â increment to Firefox 3, the number of improvements slated for this release earned it a bump to a full â.5â upgrade. When compared to the changes from Safari 3 to Safari 4, however, it seems Mozilla could just have easily named this one Firefox 4, as there are a multitude of new and improved features.