With the latest version of Internet Explorer in beta preview, Mozilla better watch its toes. A lot of the features that make Firefox great are in jeopardy of being compromoised in the latest version of Microsoft’s staple browser. IE7 boasts a built in RSS feed sidebar and tab browsing. I love my RSS plug-in called Sage that I use with Firefox. The tab-browsing is something that led me to Firefox and I could never use a browser without it.