At the Mozilla Blog, they're noting: "For the first time in either a weekly or monthly period, Firefox surpassed 20% worldwide market share (according to Net Applications)."

At the same time, Microsoft's Internet Explorer has reportedly lost a significant amount of browser market share - - apparently to all of its major competitors including Apple.

So far this year, Net Applications reports that Firefox' market share has jumped from 16.8 percent to 19.97 percent, while Microsoft's Internet Explorer browser has dropped from 76.04 percent to 71.27 percent. Apple's Safari web browser market share, at the same time, has increased almost a full percentage point from 5.59 percent to 6.57 percent. (Google's new Chrome Browser, after two months, is running a 0.74 percent share and Opera is at 0.75 percent. (Some 0.45 percent of users in the market are sticking with Netscape, according to the report.)

On one day alone, June 18, which Mozilla called "Firefox Day," more than 8 million downloads of Firefox 3.0 were recorded. Mozilla now has version 3.1 in beta testing. Microsoft is still officially on Internet Explorer Version 7, but IE 8 has been in beta testing since March.