History of Firefox updates automatically update Firefox to the latest version without notifying the user, a feature that the web browsers Google Chrome and Internet Explorer 8 and above have already implemented, although the user is able to disable that function. Mozilla improved regular startup time for Windows users. Firefox 16 was released on October 9, 2012. Plans for this version called for fixing of bugs still outstanding involving support of new features in Mac OS X Lion, improvements to startup speed when a user wants to restore a previous session, and support for viewing PDF files inline without a plugin. Opus audio
Internet Explorer 9 "distinctive and excellent" ActiveX filtering and Tracking Protection features might be "perplexing for less technical users." Having reached release candidate status eleven months after it was originally announced at the March 2010 MIX conference, "Microsoft's development process is too slow." The new version is "a good modern browser" but "the competition is moving faster." "Computing" observed that "the feature set has piled up" since development began, with recent changes including "a completely rejigged JavaScript engine, and far better web standards support." It reported that Internet Explorer 9 RC ranked above Firefox, slightly above Safari, and below Chrome and Opera on