While Firefox's market share reached 15 percent in the US last month, eWeek is reporting that it's hit 13.71 percent world wide. However, the browser's spread has been hindered by recently publicized security flaws and lingering incompatibility issues, especially in the corporate sector. eWeek also cites trouble in the form of IE7, which Microsoft will push out as an automatic update, as well as their not-quite-ecstatic reaction to the first beta of Firefox 2.0 in light of how competitors like Opera 9 and IE7 are closing the gap.

I guess only time will tell how the official 2.0 release, slated for late September, boosts the spread of Firefox.